An optical transmitter, consisting of a radiation source which is adapted to generate a base optical beam with a base wavelength. The transmitter further consists of at least one modulator which is coupled to modulate the base optical beam so as to generate multiple carrier beams at respective side-bands...http://www.google.de/patents/US20040208644?utm_source=gb-gplus-sharePatent US20040208644 - Sub-carrier generation for optical communication
