In recent years, much work has been done on the frequency stabilization of laser diodes through the electrical feedback loop, using for a frequency discriminator an optical resonator such as a fiber loop, a Fabry-Perot, or an atomic or molecular phenomenon. While allowing a reduction of frequency fluctuations, the lattar approach also gives the possibility of fixing precisely the absolute value of the laser frequency (wavelength) according to the quantum mechanics that govern the optical transition. Thus, if many resonances are observable in a close optical frequency domain, many sources can be set to precise distinguishable frequencies and become part of a muitiwavelength coherent communication system where the channel selectivity is done at the intermediate frequency level.1

© 1989 Optical Society of America

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