Abstract
The ability to write permanent gratings into the core of amplifying fibers has made possible the recent demonstration of fiber distributed feedback (DFB) lasers.1-4 Single-frequency operation of these lasers has been achieved at 1.5 µm in Er3+-doped fibers,1,3,4 and at 1.047 µm in a Yb3+ system2 by using quarter-wave shifted DFB structures. Because of their narrow linewidth and compatibility with fiber communication systems, such DFB fiber lasers may become useful alternatives to DFB semiconductor lasers.
© 1996 Optical Society of America
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