We developed and fabricated an all-fiber add–drop filter by recording a Bragg grating in the waist of an asymmetric mode converter–coupler formed by adiabatic tapering and fusing of two locally dissimilar, single-mode optical fibers. The insertion loss of the device was ~0.1 dB .A narrow spectral bandwidth (<1 nm) and a large add–drop efficiency (>90%) were also demonstrated. In addition, the filter was polarization independent.
© 1998 Optical Society of America
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2340) Fiber optics and optical communications : Fiber optics components
(060.4230) Fiber optics and optical communications : Multiplexing
(120.2440) Instrumentation, measurement, and metrology : Filters
Anthony S. Kewitsch, George A. Rakuljic, Phil A. Willems, and Amnon Yariv, "All-fiber zero-insertion-loss add-drop filter for wavelength-division multiplexing," Opt. Lett. 23, 106-108 (1998)