Er3+-doped fibers have been widely investigated to offer convenient laser sources [1] and optical amplifiers [2], [3] operating at the 1.5 µm region. To apply these lasers to optical coherent communications, especially for homodyne detection, much effort to narrow their linewidths has been made by using fiber-gratings in Fabry-Perot fiber cavities[4]-[6]. So far, the linewidths were more than 1MHz[5] mainly restricted by the rather low quality factor of the cavities. On the contrary, all fiber-ring-cavity has the potential for achieving the high quality factor, since the cavity loss can be easely reduced by using low loss fibers.

© 1989 Optical Society of America

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