A frequency stabilized optical signal source is provided. A laser produces an optical carrier at a wavelength .lambda.. Feedback is provided to adjust the wavelength .lambda.. In order to provide the feedback, a portion of the optical carrier is modulated by a periodic reference signal. An optical fiber...http://www.google.de/patents/US5208819?utm_source=gb-gplus-sharePatent US5208819 - Optical source with frequency locked to an in-fiber grating resonantor
