A noninterferometric optical fiber add–drop channel filter based on a mismatched twin-core photosensitive-cladding fiber and long-period fiber grating is demonstrated. With assistance from the fiber grating, codirectional spectrally selective cross coupling between the two cores can be realized with an efficiency of 90%.
© 2004 Optical Society of America
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.2340) Fiber optics and optical communications : Fiber optics components
(120.2440) Instrumentation, measurement, and metrology : Filters
Honglin An, Brian Ashton, and Simon Fleming, "Long-period-grating-assisted optical add-drop filter based on mismatched twin-core photosensitive-cladding fiber," Opt. Lett. 29, 343-345 (2004)