Narrowband fiberoptic spectral filter formed from fibers having

Details Narrowband fiberoptic spectral filter formed from fibers having Narrowband fiberoptic spectral filter formed from fibers having

1989-04-05

1990-12-11

Ullah, Akm

Optics: measuring and testing

Range or remote distance finding

With photodetection

350 9615, 350 9629, 356 731, G02B 622, G02B 626, G02B 602, G01N 2100

Patent

active

049765124

ABSTRACT:
A narrowband optical fiber spectral filter comprises a fiber optic coupler formed from a W fiber and step index fiber. The W index fiber comprises a core having a high index of refraction. The core is surrounded by an inner cladding that has a very low index of refraction. An outer cladding surrounds the inner cladding and has an index of refraction that is greater than that of the inner cladding but less than that the core. The core of the step index fiber is surrounded by an outer cladding that preferably has the same index of refraction as the outer cladding of the first fiber. The two fibers are fused together to form a fiberoptic coupler that has an interaction region of predetermined length. The resulting fiberoptic coupler has different transmission characteristics for the two component fibers at which light can transfer between the fibers. The dispersion characteristics are the same for only a very narrow range of wavelengths. The resulting spectral filter thus has a narrower bandwidth than obtained by modifying other parameters of a fiberoptic spectral filter.

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