Abstract

A theoretical analysis is presented of an optical-fiber loop resonator with a collinear (planar) 3 × 3 fiber coupler in which the cores of the three fibers inside the coupler lie in the same plane. Six different types of the fiber loop resonator (types 1–6) can be constructed in conjunction with different inputs. Expressions for the circulating (resonant) and output intensities and resonance conditions of the six types are derived. Performance parameters such as finesse, cross talk, and maximum output intensity are evaluated when these fiber loop resonators are used as spectral filters and as closely spaced two-channel wavelength-division multiplexer–demultiplexers. Computed results indicate that full resonances cannot be reached simultaneously for both output intensities and that, in general, the output characteristics of the type 5 loop resonator are the best, followed by those of type 6.

© 1994 Optical Society of America

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