Abstract
We present a coupled-mode analysis of a six-port coupler consisting
of three parallel uniform long-period fiber gratings, where a longitudinal
offset distance may be introduced between the gratings. In particular, we
discuss the effects of the grating coupling coefficient and the evanescent-field
coupling between the parallel fibers on the performance of the coupler. Our
theoretical results compare well with the experimental data for several typical
couplers. The method of analysis together with the numerical illustrations
presented in the paper can facilitate the design of this new class of six-port
all-fiber wavelength-selective couplers with applications in add/drop multiplexing,
signal processing, and broadband filtering.
© 2008 IEEE
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