Optical filtering

Details Optical filtering Optical filtering

1996-01-31

1997-07-08

Ullah, Akm E.

Optical waveguides

With optical coupler

Particular coupling function

385 37, G02B 626

Patent

active

056470371

ABSTRACT:
An optical waveguide transmission filter has a 3 dB single mode waveguide coupler that is provided on one side of its coupling region with a spectrally matched pair of retro-reflecting optical waveguide Bragg grating reflectors. The optical path distance of one of the Bragg reflectors from the coupling region is greater than the equivalent distance of the other Bragg reflector by an amount greater than half the coherence length of a signal having a spectral width matched with that of the Bragg reflectors.

REFERENCES:
patent: 4155056 (1979-05-01), Cross et al.
patent: 4676642 (1987-06-01), French
patent: 4722604 (1988-02-01), French
patent: 4900119 (1990-02-01), Hill et al.
patent: 5048909 (1991-09-01), Henry
patent: 5151585 (1992-09-01), Siebert
patent: 5195161 (1993-03-01), Adar et al.
patent: 5305402 (1994-04-01), Hill et al.

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