We propose a new recirculating fiber delay-line filter
structure. In the proposed system a fiber Bragg grating (FBG)
is used as a multireflection mirror in a fiber delay loop, and an
erbium-doped fiber is used to provide gain in the loop. By
adjusting parameters such as the coupling efficiency, the reflectivity
of the FBG, and the gain, we can change the characteristics of the
filter transfer function.
© 1998 Optical Society of America
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