Abstract
The fiber laser is a potential laser source for fiber systems. To apply the fiber laser to optical coherent communications, especially for homodyne detection, it is necessary to narrow the laser linewidth. Several methods for narrowing output linewidth from a fiber laser were reported, such as using a fiber grating in laser cavity1 or the Fox–Smith resonator.2 In the cases the fiber laser has a large cavity loss and the manufacture technique is complicated.
© 1991 Optical Society of America
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