CN101547447B - Broadband wireless signal covering network based on passive optical network structure - Google Patents
Broadband wireless signal covering network based on passive optical network structure Download PDFInfo
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- CN101547447B CN101547447B CN2009100686833A CN200910068683A CN101547447B CN 101547447 B CN101547447 B CN 101547447B CN 2009100686833 A CN2009100686833 A CN 2009100686833A CN 200910068683 A CN200910068683 A CN 200910068683A CN 101547447 B CN101547447 B CN 101547447B
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Abstract
The invention relates to a broadband wireless signal covering network based on a passive optical network structure. The network comprises a first fiber power divider/wave combiner, a plurality of user terminal units, an optical wavelength multiplexing/de-multiplexing device, a second fiber power divider/wave combiner and a broadband photoreceiver, wherein the first fiber power divider/wave combiner allocates light carrier signals of a light emitter to a plurality of fiber power dividers; a plurality of the user terminal units correspondingly receive the light carrier signals of the fiber power dividers, emit the light carrier signals to air and receive user uplink RF signals through antennas; the optical wavelength multiplexing/de-multiplexing device collects user uplink optical signals of a plurality of the user terminal units and transmits the signals to the uplink direction; the second fiber power divider/wave combiner collects the user uplink optical signals and transmits the signals to the uplink direction; and the broadband photoreceiver converts the received multi-wavelength user uplink optical signals into multi-bandwidth broadband RF signals and sends the signals to upper layer equipment. The broadband wireless signal covering network solves the problem of realizing broadband wireless communication for large-scale indoor multiuser, strengthens the adaptability to the horizontal dynamic change of uplink optical signal power and can adapt to the functional requirement of various wireless communication systems.
Description
Technical field
The present invention relates to a kind of broadband wireless signal covering network.Particularly relate to a kind of broadband wireless signal covering network that fairly large and large-scale indoor broadband wireless signal covers that is suitable for based on passive optical network structure.
Background technology
Along with popularizing of 3G technology, the continuous development of 4G and millimeter-wave technology, wireless technology has the trend that further develops to the high-frequency section, and is the mode of multiple standard and the coexistence of multiple band signal.Because high-frequency signal space attenuation is big and the restriction of cable transmission characteristic, especially under the indoor environment of complexity, the transmission of broadband wireless signal and covering problem have become and have become increasingly conspicuous.Statistics shows that most of wireless signal transmitting-receiving is to take place under the indoor environment, and the WiMAX that does not solve indoor environment covers satisfied broadband wireless service can't be provided, and indoor covering has become problem demanding prompt solution in the ng mobile communication.The mode that the Optical Fiber Transmission wireless signal is generally had an optimistic view of, this mainly is that the optical fiber repeater in 2G epoch is exactly a good example because optical fiber has high bandwidth and low-loss characteristic, optical fiber repeater has been realized the function that base station signal zooms out.Yet, present optical fiber repeater is based on point-to-point mode, be applied under optical fiber distributed type antenna system (ODAS) situation of point-to-multipoint, distinct issues are exactly that the upward signal optical transmission is difficult to solve well, under the situation that the user increases, wavelength resource finite sum photoelectric device price problem of higher sharply rises system cost.At up optical transmission problem, technical development at FTTH in the recent period merits attention, by adopting local side power light source and user side to adopt the WDMPON technology of injection locking F-P cavity semiconductor laser is the up optical transmission mode of a kind of low-cost FTTH that is expected, and can be used for reference in ODAS fully; Yet also should see, even adopt all optical wavelength of series of DWDM, its quantity remains limited, when number of users further increases, the limited contradiction of wavelength resource just can be given prominence to, and how to realize under the framework of WDMPON that therefore the multi-user's access more than DWDM complete series number of wavelengths also is an important problems.
Summary of the invention
Technical problem to be solved by this invention is, provide a kind of and realize that by the fiber distribution antenna system configuration that adopts covering of downlink broadcast broadband and up wavelength division multiplexing fairly large and large-scale indoor broadband wireless signal covers, shift frequency coupling by many band signal transmission of optical fiber and user terminal, can adapt to the covering requirement of multiple different radio communication system (standard) and different user scale, and under the framework of WDMPON, the mode of reusing by optical wavelength realizes the broadband wireless signal covering network based on passive optical network structure that the multizone multi-user more than DWDM complete series number of wavelengths inserts.
The technical solution adopted in the present invention is: a kind of broadband wireless signal covering network based on passive optical network structure, include: optical sender, be used for the base station down broadband RF signal is modulated into optical carrier and emission, at the more users situation, the RF signal of a plurality of system bandwidths constitutes many band RF signals through frequency displacement and is modulated on the optical carrier together; First optical fiber power distributor/wave multiplexer is distributed to a plurality of optical fiber power distributors to the optical carrier of optical sender in the future, and each optical fiber power distributor finally distributes; A plurality of subscriber terminal units, the corresponding final optical carrier that distributes of optical fiber power distributor that receives, be transmitted in the air by antenna through opto-electronic conversion and frequency displacement processing back, receive user uplink RF signal by antenna simultaneously, modulation specific wavelength light source forms up optical carrier after frequency displacement is handled; Optical wavelength multiplexing/demultiplexing device compiles the user uplink optical carrier that sends from a plurality of subscriber terminal unit, transmits to up direction; Second optical fiber power distributor/wave multiplexer compiles the user uplink optical carrier from a plurality of optical wavelength multiplexings/demultiplexing device, and transmits to up direction; The broadband light receiver, the broadband RF signal that the user uplink optical carrier that is used for the multi-wavelength that will receive is converted to a plurality of bandwidth is sent to upper layer device.
For large-scale broadband wireless signal covering network, for the photo-beat of avoiding the identical wavelength that up light-receiving occurs is disturbed frequently, must be in certain frequency band with the up frequency limitation of RF signals of being with more, this restriction is relevant with the light multi-wavelength system that is adopted, and concrete optical source wavelength with DWDM optical filter characteristic that adopted and multi-user is relevant; Variant user adopts the different channel frequency of system assignment to modulate up optical carrier, corresponding optical receiver in the whole network, and it is simultaneously up not allow to occur simultaneously two identical frequency channels.
The broadband light receiver has incident light carrier signal dynamic range self adaptation adjustment capability, change characteristics to adapt to the distinctive optical carrier of PON structure, the broadband light receiver is by adding multi-wavelength optical fiber preamplifier before the broadband light electric explorer, realization is at the quick gain control function of the big dynamic change of input multi-wavelength light carrier signal, guaranteeing that the optical carrier that each up user's optical carrier can keep the relatively stable of gain and enter into the broadband light electric explorer has suitable power level, also integratedly in the broadband light receiver receive the broadband automatic gain control RF amplifier of broadband photo detector signal and be with modular converter under the frequency displacement more.
During the up structure of described network using single fiber, include optical sender, be used for downstream broadband RF signal modulation in station is constituted many band RF flashlight carrier waves and emission; An optical fiber power distributor is used for the many band RF optical carriers from optical sender are distributed to a plurality of subscriber terminal units; A plurality of subscriber terminal units, the corresponding optical carrier that receives the distribution of optical fiber power distributor, be transmitted in the air by antenna through opto-electronic conversion and necessary frequency displacement processing back, receive mobile subscriber's upstream rf signal by antenna simultaneously, modulation specific wavelength light source forms up optical carrier after the frequency displacement of necessity is handled; An optical wavelength multiplexing/demultiplexing device will be given a plurality of subscriber terminal units from the multi wave length illuminating source signal allocation of high-power CW multi wave length illuminating source, compile the user uplink optical carrier that sends from a plurality of subscriber terminal unit, and transmit to up direction; High-power CW multi wave length illuminating source is as the exciting light source of subscriber terminal unit specific wavelength optical sender; Optical circulator with user uplink optical carrier and multi-wavelength exciting light source Signal Separation, makes the user uplink optical carrier enter the broadband light receiver, and the broadband RF signal that is converted to a plurality of bandwidth by the broadband light receiver is sent to upper layer device.
During the two fine up structure of described network using, include optical sender, be used for the modulation of base station down broadband RF signal is constituted many band RF signals and emission; An optical fiber power distributor is used for the many band RF optical carriers from optical sender are distributed to a plurality of subscriber terminal units; A plurality of subscriber terminal units, the corresponding optical carrier that receives the distribution of optical fiber power distributor, be transmitted in the air by antenna through opto-electronic conversion and necessary frequency displacement processing back, receive mobile subscriber's upstream rf signal by antenna simultaneously, modulation specific wavelength light source forms up optical carrier after the frequency displacement of necessity is handled; High-power CW multi wave length illuminating source is as the light signal of the specific wavelength optical sender of subscriber terminal unit; Optical wavelength multiplexing/demultiplexing device will be given a plurality of subscriber terminal units from the multi wave length illuminating source signal allocation of high-power CW multi wave length illuminating source; Second optical wavelength multiplexing/demultiplexing device compiles the uplink optical signal from a plurality of subscriber terminal units, sends to optical receiver, and by the broadband light receiver, the broadband RF signal that is converted to a plurality of bandwidth is sent to upper layer device.
Described high-power CW multi wave length illuminating source includes: the prime fiber amplifier is used to provide wideband A SE radiation; Back level fiber amplifier is used for multi-wavelength signals is carried out power amplification; Be connected the thin shape optical filter between prime fiber amplifier (7.1) and the back level fiber amplifier (7.3).
Described a plurality of subscriber terminal unit is the bidirectional transmit-receive module that a photoelectricity mixes, and downstream signal transmits and comprises a broadband light receiver; A wideband RF amplifier is used for the RF signal that amplified broad band optical receiver (5.1) is exported; Shared pair of merit device of module is by the descending RF signal of antenna transmission; Upward signal transmits and comprises the antenna that receives upstream rf signal, shared pair of merit device of module, a wideband RF amplifier, an injection locking F-P cavity semiconductor laser, specific wavelength optical carrier from high-power CW multi wave length illuminating source is locked in specific wavelength with injection locking F-P cavity semiconductor laser, and injection locking F-P cavity semiconductor laser forms up optical carrier after the output modulation of wideband RF amplifier (5.4).Described a plurality of subscriber terminal unit is the bidirectional transmit-receive module that a photoelectricity mixes, and downstream signal transmits and comprises a broadband light receiver; A wideband RF amplifier is used for the RF signal that amplified broad band optical receiver (5.1) is exported; Shared pair of merit device of module is by the descending RF signal of antenna transmission; Upward signal transmits and comprises the antenna that receives upstream rf signal, shared pair of merit device of module, a wideband RF amplifier, an electric absorption broad band electrooptic modulator, the output of wideband RF amplifier is modulated on the electric absorption broad band electrooptic modulator, from the specific wavelength light signal of high-power CW multi wave length illuminating source in the electric absorption broad band electrooptic modulator through RF signal modulation back formation uplink optical signal.
Described a plurality of subscriber terminal unit has the frequency displacement function, and the broadband light receiver described in downstream signal transmits is to also being disposed with downstream broadband RF pre-amplifier, an OUN local oscillator unit, descending band pass filter and downstream broadband RF power amplifier between shared pair of merit device of module; Shared pair of merit device of module described in upward signal transmits is to also setting gradually up broadband RF low noise amplifier, an OUN local oscillator unit, up band pass filter and up broadband light transmitter driving amplifier between the electrooptic modulation broadband light transmitter.
The RF signal of described a plurality of system bandwidths is respectively applied for and covers different a plurality of zones, so that the maximum number of user amount that realization system air interface limits in zone separately, the RF signal of a plurality of system bandwidths is respectively applied for covers different a plurality of zones and be applicable to that also the RF signal of a plurality of system bandwidths described in outdoor many cell-site antennas and the base stations control still is the wireless communication signal of different systems, comprise different frequency range, different modulating mode and the situation that the overlapping frequency range is arranged, in subscriber terminal unit, send or receive, be used to realize that the wireless communication signal of different systems covers through different RF paths and antenna.
Broadband wireless signal covering network based on passive optical network structure of the present invention has the following advantages and good effect:
1. by the mode of Optical Fiber Transmission broadband wireless signal, wireless base station signal directly is transferred to the subregion antenna, under the situation that does not take the launching tower frequency resource, solves indoor wireless signal covering problem; By adopting many band signals optical transmission to make full use of the bandwidth resources of Optical Fiber Transmission, especially select the up ROF scheme of particular frequency bands, for covering provides more channel resource, solved the problem that extensive large-scale indoor multi-user realizes broadband wireless communications simultaneously.
2. the mode by the shared same optical receiver of uplink optical signal has further reduced the cost based on the up scheme of WDMPON, adopt the optical wavelength reuse means to solve contradiction between number of wavelengths finite sum number of users is huge, and strengthened adaptability the dynamic change of uplink optical signal power level by the method that increases the preposition image intensifer of self adaptation.
3. reduced the cost of upward signal optical transmission scheme by WDMPON structure and low-cost special wavelength light transmitter schemes
4. this solution has the advantage that can upgrade flexibly and dispose, can adapt to the functional requirement of multiple different radio communication system.
Description of drawings
Fig. 1 is based on the overall structure schematic diagram of fiber distribution antenna (ODAS) network of EPON;
Fig. 2 is multi-user's uplink optical signal spectral composition and RF frequency band limits schematic diagram;
Fig. 3 is the structured flowchart that comprises the up optical receiver of adaptive optical signal power control;
Fig. 4 is based on fiber distribution antenna (ODAS) schematic network structure of the up WDMPON of injection locking wavelength;
Fig. 5 is based on fiber distribution antenna (ODAS) schematic network structure of the up WDMPON of EA modulator;
Fig. 6 is based on the high-power CW multi wave length illuminating source structural representation of fiber amplifier;
Fig. 7 is a subscriber terminal unit structural representation of realizing user's optical sender specific wavelength;
Fig. 8 is a subscriber terminal unit structural representation of realizing the another kind of embodiment of user's optical sender specific wavelength;
Fig. 9 is the subscriber terminal unit structural representation with frequency shift function;
Figure 10 is fiber distribution antenna (ODAS) schematic network structure with multi-modulation scheme wireless signal covering function;
Figure 11 is the subscriber terminal unit structural representation with multi-modulation scheme wireless signal covering function.
Wherein:
1: optical sender 2: the broadband light receiver
2.1: multi-wavelength optical fiber preamplifier 2.2: broadband light electric explorer
2.3: modular converter under broadband automatic gain control RF amplifier and the frequency displacement of many bands
3: the first optical fiber power distributor/wave multiplexers
3 ': second optical fiber power distributor/wave multiplexer 4: optical fiber power distributor
5: subscriber terminal unit 5.1 broadband light receivers
5.21: injection locking F-P cavity semiconductor laser
5.22: the electric absorption broad band electrooptic modulator
5.3: wideband RF amplifier 5.32: downstream broadband RF power amplifier
5.33: descending band pass filter 5.34:OUN downstream broadband RF power amplifier
5.35:OUN descending band pass filter 5.4: wideband RF amplifier
5.41: up broadband light transmitter driving amplifier 5.42: up broadband RF low noise amplifier
5.43 the up broadband RF low noise amplifier of up band pass filter 5.44:OUN
5.45:OUN up band pass filter 5.5: shared pair of merit device of module
5.6: 5.7: the two OUN local oscillators unit, an OUN local oscillator unit
5.8:OUN RF duplexer+antenna 6: optical wavelength multiplexing/demultiplexing device
6 ': second optical wavelength multiplexing/demultiplexing device 7: high-power CW multi wave length illuminating source
7.1: prime fiber amplifier 7.2: dredge the shape optical filter
7.3: back level fiber amplifier 8: optical circulator
Embodiment
Below in conjunction with embodiment and accompanying drawing the broadband wireless signal covering network based on passive optical network structure of the present invention is made a detailed description.
It is proposed by the invention that a kind of (or claiming base station local side) to the DAS scheme of indoor user antenna is from the wireless base-station control center, make full use of the big superiority bandwidth of broadband RF technology and optical sender/receiver, by adopting EPON (PON) structure, following behavior broadcasting coverage mode; Up on the basis of adopting the WDMPON structure, solve the contradiction of number of wavelengths finite sum number of users between huge by the optical wavelength reuse means, up multiple wavelength optical signal adopts the least possible broadband light receiver after arriving the base station local side, under the situation that realizes the indoor covering of extensive multiple spot, further reduce local side apparatus quantity, reduce system cost.
The present invention realizes covering based on the broadband wireless signal of optical transmission by a kind of optical fiber passive network configuration of two-stage framework, specifically comprise and adopt the least possible local side optical sender and optical receiver, the multi-region customer solution that WDMPON user uplink optical transport solution and optical wavelength subregion are reused.
As shown in Figure 1, the broadband wireless signal covering network based on EPON (PON) structure of the present invention
Include: optical sender 1, be used for radio communication system base station controller local side downstream broadband RF signal is modulated at light carrier, normally single optical wavelength signal, cover number of spots for increasing, realize that the more broadband wireless user of local environment can be simultaneously online, the broadband RF signal of a plurality of system bandwidths is constituted many band RF signals by the frequency displacement mode, and be modulated on the light wave and launch; First optical fiber power distributor/wave multiplexer 3 connects optical sender 1 by an optical fiber (normally monomode fiber), and gives a plurality of optical fiber power distributors 4 with the signal allocation that optical sender 1 is launched, and each optical fiber power distributor 4 finally distributes; A plurality of subscriber terminal units (OUN) 5, the corresponding optical fiber power distributor 4 final light signals that distribute that receive, be with the RF signals at a plurality of subscriber terminal units 5 through opto-electronic conversion output more, many band RF signals are by frequency displacement and be with the logical air interface frequency band that each isolation region reverts to wireless system that is chosen in, amplifying the back is transmitted in the air by antenna, each isolated area (user) satisfies the demand that the interior multi-user simultaneously in district realizes broadband access to greatest extent by frequency reuse, subscriber terminal unit (OUN) 5 receives the up RF signal of mobile subscriber by antenna simultaneously, after the amplification of necessity and frequency displacement are handled, be modulated at and constitute the user uplink light signal on the specific wavelength light source, frequency displacement is handled and will be carried out according to system requirements, its principle is, in the reception bandwidth of whole broadband light receivers 2, for each mobile subscriber who is in the covering system provides unique wireless channel; Optical wavelength multiplexing/demultiplexing device 6 compiles and transmits the user uplink light signal that a plurality of subscriber terminal units 5 are sent; Second optical fiber power distributor/wave multiplexer 3 ' (reverse optical fiber power distributor), compile the user uplink light signal that a plurality of optical wavelength multiplexings/demultiplexing device 6 compiles, and send the broadband light receiver 2 at base station place to by optical fiber, be sent to upper layer device after being converted to broadband RF signal.Total RF bandwidth of upward signal is corresponding fully with downstream signal, the up-link capacity of each isolated area adopts shared mechanism, attainable maximum up-link capacity is the peak capacity (being similar to the independent sector of exterior aerial) that system's air interface frequency band limits in each isolated area, therefore can adapt to the requirement that local multi-user inserts simultaneously.
For large-scale broadband wireless signal covering network, from different large users and be pooled to second optical fiber power distributor/wave multiplexer 3 ' uplink optical signal co-wavelength (light wave co-wavelength can appear, the RF different frequency range) injects the situation of broadband light receiver 2 simultaneously, for the photo-beat of avoiding the identical wavelength that up light-receiving may occur is disturbed frequently, should limit the frequency range of RF, with up, being with the frequency limitation of RF signals in certain frequency band more, this restriction is relevant with the light multi-wavelength system that is adopted, and DWDM optical filter characteristic concrete and that adopted is relevant.Say that simply such as under the narrower situation of DWDM optical filter bandwidth, the frequency range that photo-beat is disturbed frequently also can be lower slightly, in many band RF signal frequency low sides of selective system, just can relax like this to low frequency; And be with the high-end DWDM of the being subjected to optical filter of RF signal frequency gap size to limit more, at interval big more, be with that the RF signal frequency is high-end can be high more more.As shown in Figure 2, for the DWDM system that is adopted, suppose that frequency bandwidth is f1 in the optical filter passband, passband is f2 at interval, and when RF transmission band during at f1 ~ f2-f1, the light wave beat frequency disturbs can obtain fine evading.
The multiple wavelength optical signal of user uplink can have two kinds of up structures, i.e. up the and two fine up structures of single fiber.
As shown in Figure 4, during the up structure of described network using single fiber, include optical sender 1, be used for the modulation of base station down broadband RF signal is constituted many band RF flashlight carrier waves and emission; An optical fiber power distributor 4 is used for the many band RF optical carriers from optical sender 1 are distributed to a plurality of subscriber terminal units 5; A plurality of subscriber terminal units 5, the corresponding optical carrier that receives 4 distribution of optical fiber power distributor, be transmitted in the air by antenna through opto-electronic conversion and necessary frequency displacement processing back, receive mobile subscriber's upstream rf signal by antenna simultaneously, modulation specific wavelength light source forms up optical carrier after the frequency displacement of necessity is handled; An optical wavelength multiplexing/demultiplexing device 6 will be given a plurality of subscriber terminal units 5 from the multi wave length illuminating source signal allocation of high-power CW multi wave length illuminating source 7, and compile the user uplink light signal that is sent from a plurality of subscriber terminal units 5, transmit to up direction; The high-power CW multi wave length illuminating source 7 of local side is as the exciting light source of subscriber terminal unit 5 specific wavelength optical senders; In the base station or the light directional transmissions device that adopts of local side, it is optical circulator 8, with user uplink light signal and local side multi-wavelength exciting light source Signal Separation, make user's uplink optical signal enter broadband light receiver 2, be converted to broadband RF signal by broadband light receiver 2 and be sent to upper layer device.Owing to adopt the local side pumping signal of single fiber and OUN upward signal to be total to the road transmission plan, can reduce number of fibers and light multiplexing demultiplexing device quantity, but need adopt optical circulator 8 that uplink optical signal is separated with the multi-wavelength pumping signal at local side, make uplink optical signal enter broadband light receiver 2.
And in the up structure of two fibres, up multiple wavelength optical signal in the base station or local side directly enter broadband light receiver 2.
As shown in Figure 5, during the two fine up structure of described network using, include optical sender 1, be used for the modulation of base station down broadband RF signal is constituted many band RF signals and emission; An optical fiber power distributor 4 is used for the many band RF optical carriers from optical sender 1 are distributed to a plurality of subscriber terminal units 5; A plurality of subscriber terminal units 5, the corresponding optical carrier that receives 4 distribution of optical fiber power distributor, be transmitted in the air by antenna through opto-electronic conversion and necessary frequency displacement processing back, receive mobile subscriber's upstream rf signal by antenna simultaneously, modulation specific wavelength light source forms up optical carrier after the frequency displacement of necessity is handled; The high-power CW multi wave length illuminating source 7 of local side is as the light signal of the specific wavelength optical sender of subscriber terminal unit 5; Optical wavelength multiplexing/demultiplexing device 6 will be given a plurality of subscriber terminal units 5 from the multi wave length illuminating source signal allocation of high-power CW multi wave length illuminating source 7; Second optical wavelength multiplexing/demultiplexing device 6 ', compile uplink optical signal from a plurality of subscriber terminal units 5, send the broadband to optical receiver 2, by broadband light receiver 2, the broadband RF signal that is converted to a plurality of bandwidth is sent to upper layer device.Here will be by fiber distribution to user's specific wavelength CW light signal as the specific wavelength light source of subscriber terminal unit 5, the OUN uplink optical signal is through another root optical fiber and second optical wavelength multiplexing/demultiplexing device 6 ' pass back local side, enter broadband light receiver 2, this scheme does not need to adopt optical circulator.
As shown in Figure 3, described broadband light receiver 2 has incident optical signal dynamic range self adaptation adjustment capability, to adapt to the distinctive change in optical signal characteristics of PON structure.Comprise: multi-wavelength optical fiber preamplifier 2.1, receive the broadband light electric explorer 2.2 of multi-wavelength optical fiber preamplifier 2.1 output signals, with have modular converter 2.3 under broadband automatic gain control RF amplifier and the frequency displacement of many bands, the quick gain control function that multi-wavelength optical fiber preamplifier 2.1 is realized at the big dynamic change of input multiple wavelength optical signal, to guarantee that the light signal that each up user's light signal can keep the relatively stable of gain and enter broadband light electric explorer 2.2 has suitable power level, make that broadband light receiver 2 can obtain high-quality RF signal all the time in the upward signal change procedure.
As shown in Figure 6, described high-power CW multi wave length illuminating source 7 includes: prime fiber amplifier 7.1 is used to provide wideband A SE radiation; Back level fiber amplifier 7.3 is used for multi-wavelength signals is carried out power amplification; Be connected the thin shape optical filter 7.2 between prime fiber amplifier 7.1 and the back level fiber amplifier 7.3, each centre wavelength of dredging shape optical filter 7.2 is accurately corresponding with optical wavelength multiplexing/each centre wavelength of demultiplexing device of far-end, dredges the shape optical filter and can adopt a pair of device that is same as far-end optical wavelength multiplexing/demultiplexing device to realize.
As shown in Figure 7, described a plurality of subscriber terminal unit 5 is bidirectional transmit-receive modules that a photoelectricity mixes, downstream signal transmits and comprises a broadband light receiver 5.1, and its RF bandwidth can cover whole downstream signal bandwidth, comprises the total bandwidth of the many band signals that adopt the frequency displacement mode; A wideband RF amplifier 5.3 is used for the RF signal that amplified broad band optical receiver 5.1 is exported; Shared pair of merit device 5.5 of module and antenna, and by the descending RF signal of antenna transmission; Upward signal transmits and comprises the antenna that receives upstream rf signal, shared pair of merit device 5.5 of module, a wideband RF amplifier 5.4, an injection locking F-P cavity semiconductor laser 5.21, specific wavelength light signal from high-power CW multi wave length illuminating source 7 is distributed to the specific user behind light multiplexing demultiplexing device 6, injection locking F-P cavity semiconductor laser 5.21 is locked in specific wavelength, the RF bandwidth of injection locking F-P cavity semiconductor laser 5.21 can cover whole upward signal bandwidth, and injection locking F-P cavity semiconductor laser 5.21 forms uplink optical signal after the output modulation of wideband RF amplifier 5.4.Can comprise among the ONU 5 on the frequency/following modular converter, ONU can be mated the broadband signal frequency band and the user terminal frequency band of optical transmission, both can adapt to the requirement for signal coverage under many bands of frequency displacement mode, also can under optical fiber IF transmission conditions, realize the covering of high band more such as millimeter wave equifrequent signal.
As shown in Figure 8, described a plurality of subscriber terminal unit 5 is bidirectional transmit-receive modules that a photoelectricity mixes, can also be: downstream signal transmits and comprises a broadband light receiver 5.1, and its RF bandwidth can cover whole downstream signal bandwidth, comprises the total bandwidth of the many band signals that adopt the frequency displacement mode; A wideband RF amplifier 5.3 is used for the RF signal that amplified broad band optical receiver 5.1 is exported; Shared pair of merit device 5.5 of module is by the descending RF signal of antenna transmission; Upward signal transmits and comprises the antenna that receives upstream rf signal, shared pair of merit device 5.5 of module, a wideband RF amplifier 5.4, an electric absorption broad band electrooptic modulator 5.22, the output of wideband RF amplifier 5.4 is modulated on the electric absorption broad band electrooptic modulator 5.22, from the specific wavelength light signal of high-power CW multi wave length illuminating source 7 in electric absorption broad band electrooptic modulator 5.22 through RF signal modulation back formation uplink optical signal.Broad band electrooptic modulator 5.22 optical signals are outside to be injected, and its wavelength injects signal deciding by the outside, and its RF bandwidth can cover whole upward signal bandwidth.Can comprise frequency (on/down) modular converter among the ONU, ONU can be mated the broadband signal frequency band and the wireless user terminal frequency band of optical transmission, both can adapt to the requirement for signal coverage under many bands of frequency displacement mode, also can under optical fiber IF transmission conditions, realize the covering of high band more such as millimeter wave equifrequent signal.
As shown in Figure 9, the broadband light receiver 5.1 described in downstream signal transmits is to being disposed with downstream broadband RF pre-amplifier 5.31, an OUN local oscillator unit 5.6, descending band pass filter 5.33 and downstream broadband RF power amplifier 5.32 between shared pair of merit device 5.5 of module; Shared pair of merit device 5.5 of module described in upward signal transmits is to setting gradually up broadband RF low noise amplifier 5.42, an OUN local oscillator unit 5.6, up band pass filter 5.43 and up broadband light transmitter driving amplifier 5.41 between the electrooptic modulation broadband light transmitter 5.21.
The RF signal of a plurality of system bandwidths of transmission of the present invention is used to cover different a plurality of zones, can realize the maximum number of user amount that system's air interface limits in the zone separately, be similar to the frequency reuse in the cellular basestation scope, the mode of this broadband many band signals optical transmission also is applicable to the signal transmission of outdoor many cell-site antennas and base station control center.
The RF signal of a plurality of system bandwidths of transmission of the present invention can also be the wireless communication signal of different systems, different systems had both comprised different frequency range, different modulating mode, even the situation that the overlapping frequency range is arranged also can adopt the shift frequency mode to solve, in subscriber terminal unit 5, can send, be used to realize that the wireless communication signal of different systems covers through different RF path and antennas.
Figure 10 is a kind of schematic diagram of realizing fiber distribution antenna (ODAS) network configuration that the multi-modulation scheme wireless signal covers, by the multi-modulation scheme wireless signal is carried with different frequency range RF signal respectively, realize the covering of multi-modulation scheme wireless signal, this mode requires that the RF unit corresponding with the multi-modulation scheme wireless signal arranged in the subscriber terminal unit (ONU) 5, comprises different antenna systems; When self frequency range of multi-modulation scheme wireless signal is not conflicted and within light transmits and receives the unit frequency bandwidth time, these different frequency ranges RF signal can be corresponding with each standard wireless signal frequency range, can adopt suitable frequency spectrum shift mode to transmit and receive the new frequency range of selection within the unit frequency bandwidth at light when conflict.
Figure 11 is the further specifying of a kind of subscriber terminal unit (ONU) 5 structures that have the shift frequency transmission and cover in fiber distribution antenna (ODAS) network configuration that covers of multi-modulation scheme wireless signal, this OUN is the mode that adopts under the transmission band of the multi-modulation scheme wireless signal situation different with covering frequency band, wherein an OUN local oscillator unit 5.6 and the 2nd OUN local oscillator unit 5.7 frequencies are determined according to system requirements, two groups of filters 5.33,5.43 and 5.35,5.45 the aerial frequency range and the optical transmission frequency range of respectively corresponding two kinds of standard wireless signals, two duplexer+antenna elements 5.5,5.8 then be the situation of only corresponding two kinds of aerial frequency ranges of standard wireless signal.
Claims (11)
1. broadband wireless signal covering network based on passive optical network structure, it is characterized in that, include: optical sender (1), be used for the base station down broadband RF signal is modulated into optical carrier and emission, at the more users situation, the RF signal of a plurality of system bandwidths constitutes many band RF signals through frequency displacement and is modulated on the optical carrier together; First optical fiber power distributor/wave multiplexer (3) is distributed to a plurality of optical fiber power distributors (4) to the optical carrier of optical sender (1) in the future, and each optical fiber power distributor (4) finally distributes; A plurality of subscriber terminal units (5), the corresponding final optical carrier that distributes of optical fiber power distributor (4) that receives, be transmitted in the air by antenna through opto-electronic conversion and frequency displacement processing back, receive user uplink RF signal by antenna simultaneously, modulation specific wavelength light source forms up optical carrier after frequency displacement is handled; Optical wavelength multiplexing/demultiplexing device (6) compiles the user uplink light signal that is sent from a plurality of subscriber terminal units (5), transmits to up direction; Second optical fiber power distributor/wave multiplexer (3 ') compiles the user uplink optical carrier from a plurality of optical wavelength multiplexings/demultiplexing device (6), and transmits to up direction; Broadband light receiver (2), the broadband RF signal that the user uplink optical carrier that is used for the multi-wavelength that will receive is converted to a plurality of bandwidth is sent to upper layer device.
2. the broadband wireless signal covering network based on passive optical network structure according to claim 1, it is characterized in that, for large-scale broadband wireless signal covering network, for the photo-beat of avoiding the identical wavelength that up light-receiving occurs is disturbed frequently, must be in certain frequency band with the up frequency limitation of RF signals of being with more, this restriction is relevant with the light multi-wavelength system that is adopted, and concrete optical source wavelength with DWDM optical filter characteristic that adopted and multi-user is relevant; Variant user adopts the different channel frequency of system assignment to modulate up optical carrier, corresponding optical receiver in the whole network, and it is simultaneously up not allow to occur simultaneously two identical frequency channels.
3. the broadband wireless signal covering network based on passive optical network structure according to claim 1, it is characterized in that, broadband light receiver (2) has incident light carrier signal dynamic range self adaptation adjustment capability, change characteristics to adapt to the distinctive optical carrier of PON structure, broadband light receiver (2) is by adding multi-wavelength optical fiber preamplifier (2.1) before at broadband light electric explorer (2.2), realization is at the quick gain control function of the big dynamic change of input multi-wavelength light carrier signal, guaranteeing that the optical carrier that each up user's optical carrier can keep the relatively stable of gain and enter into broadband light electric explorer (2.2) has suitable power level, the broadband automatic gain control RF amplifier of also integrated reception broadband light electric explorer (2.2) signal and be with modular converter (2.3) under the frequency displacement in the broadband light receiver (2) more.
4. the broadband wireless signal covering network based on passive optical network structure according to claim 1, it is characterized in that, during the up structure of described network using single fiber, include optical sender (1), be used for downstream broadband RF signal modulation in station is constituted many band RF flashlight carrier waves and emission; An optical fiber power distributor (4) is used for the many band RF optical carriers from optical sender (1) are distributed to a plurality of subscriber terminal units (5); A plurality of subscriber terminal units (5), the corresponding optical carrier that receives optical fiber power distributor (4) distribution, be transmitted in the air by antenna through opto-electronic conversion and necessary frequency displacement processing back, receive mobile subscriber's upstream rf signal by antenna simultaneously, modulation specific wavelength light source forms up optical carrier after the frequency displacement of necessity is handled; An optical wavelength multiplexing/demultiplexing device (6), to give a plurality of subscriber terminal units (5) from the multi wave length illuminating source signal allocation of high-power CW multi wave length illuminating source (7), compile the user uplink optical carrier that is sent from a plurality of subscriber terminal units (5), and transmit to up direction; High-power CW multi wave length illuminating source (7) is as the exciting light source of subscriber terminal unit (5) specific wavelength optical sender; Optical circulator (8) with user uplink optical carrier and multi-wavelength exciting light source Signal Separation, makes user's uplink optical signal enter broadband light receiver (2), and the broadband RF signal that is converted to a plurality of bandwidth by broadband light receiver (2) is sent to upper layer device.
5. the broadband wireless signal covering network based on passive optical network structure according to claim 1, it is characterized in that, during the two fine up structure of described network using, include optical sender (1), be used for the modulation of base station down broadband RF signal is constituted many band RF signals and emission; An optical fiber power distributor (4) is used for the many band RF optical carriers from optical sender (1) are distributed to a plurality of subscriber terminal units (5); A plurality of subscriber terminal units (5), the corresponding optical carrier that receives optical fiber power distributor (4) distribution, be transmitted in the air by antenna through opto-electronic conversion and necessary frequency displacement processing back, receive mobile subscriber's upstream rf signal by antenna simultaneously, modulation specific wavelength light source forms up optical carrier after the frequency displacement of necessity is handled; High-power CW multi wave length illuminating source (7) is as the light signal of the specific wavelength optical sender of subscriber terminal unit (5); Optical wavelength multiplexing/demultiplexing device (6) will be given a plurality of subscriber terminal units (5) from the multi wave length illuminating source signal allocation of high-power CW multi wave length illuminating source (7); Second optical wavelength multiplexing/demultiplexing device (6 ') compiles the up optical carrier from a plurality of subscriber terminal units (5), sends to optical receiver (2), and by broadband light receiver (2), the broadband RF signal that is converted to a plurality of bandwidth is sent to upper layer device.
6. according to claim 4 or 5 described broadband wireless signal covering networks based on passive optical network structure, it is characterized in that described high-power CW multi wave length illuminating source (7) includes: prime fiber amplifier (7.1) is used to provide wideband A SE radiation; Back level fiber amplifier (7.3) is used for multi-wavelength signals is carried out power amplification; Be connected the thin shape optical filter (7.2) between prime fiber amplifier (7.1) and the back level fiber amplifier (7.3).
7. according to claim 1 or 4 described broadband wireless signal covering networks based on passive optical network structure, it is characterized in that, described a plurality of subscriber terminal unit (5) is the bidirectional transmit-receive module that a photoelectricity mixes, and downstream signal transmits and comprises a broadband light receiver (5.1); A wideband RF amplifier (5.3) is used for the RF signal that amplified broad band optical receiver (5.1) is exported; Shared pair of merit device of module (5.5) is by the descending RF signal of antenna transmission; Upward signal transmits and comprises the antenna that receives upstream rf signal, shared pair of merit device of module (5.5), a wideband RF amplifier (5.4), an injection locking F-P cavity semiconductor laser (5.21), specific wavelength optical carrier from high-power CW multi wave length illuminating source (7) is locked in specific wavelength with injection locking F-P cavity semiconductor laser (5.21), and injection locking F-P cavity semiconductor laser (5.21) forms up optical carrier after the output modulation of wideband RF amplifier (5.4).
8. according to claim 1 or 5 based on the broadband wireless signal covering network of passive optical network structure, it is characterized in that, described a plurality of subscriber terminal unit (5) is the bidirectional transmit-receive module that a photoelectricity mixes, and downstream signal transmits and comprises a broadband light receiver (5.1); A wideband RF amplifier (5.3) is used for the RF signal that amplified broad band optical receiver (5.1) is exported; Shared pair of merit device of module (5.5) is by the descending RF signal of antenna transmission; Upward signal transmits and comprises the antenna that receives upstream rf signal, shared pair of merit device of module (5.5), a wideband RF amplifier (5.4), an electric absorption broad band electrooptic modulator (5.22), the output of wideband RF amplifier (5.4) is modulated on the electric absorption broad band electrooptic modulator (5.22), from the specific wavelength light signal of high-power CW multi wave length illuminating source (7) in electric absorption broad band electrooptic modulator (5.22) through RF signal modulation back formation uplink optical signal.
9. according to claim 7 or 8 described broadband wireless signal covering networks based on passive optical network structure, it is characterized in that, described a plurality of subscriber terminal unit (5) has the frequency displacement function, and the broadband light receiver (5.1) described in downstream signal transmits is to also being disposed with downstream broadband RF pre-amplifier (5.31), an OUN local oscillator unit (5.6), descending band pass filter (5.33) and downstream broadband RF power amplifier (5.32) between the shared pair of merit device of module (5.5); Shared pair of merit device of module (5.5) described in upward signal transmits is to also setting gradually up broadband RF low noise amplifier (5.42), an OUN local oscillator unit (5.6), up band pass filter (5.43) and up broadband light transmitter driving amplifier (5.41) between the electrooptic modulation broadband light transmitter (5.21,5.22).
10. the broadband wireless signal covering network based on passive optical network structure according to claim 1, it is characterized in that, the RF signal of described a plurality of system bandwidths is respectively applied for and covers different a plurality of zones, so that the maximum number of user amount of realization system air interface restriction in zone separately, the RF signal of a plurality of system bandwidths is respectively applied for covers the signal that different a plurality of zones also are applicable to outdoor many cell-site antennas and base station control center and transmit.
11. the broadband wireless signal covering network based on passive optical network structure according to claim 1, it is characterized in that, the RF signal of described a plurality of system bandwidths still is the wireless communication signal of different systems, comprise different frequency range, different modulating mode and the situation that the overlapping frequency range is arranged, in subscriber terminal unit (5), send or receive, be used to realize that the wireless communication signal of different systems covers through different RF paths and antenna.
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