Band-pass filter in an optical waveguide

Details Band-pass filter in an optical waveguide Band-pass filter in an optical waveguide

1997-08-29

1999-03-23

Healy, Brian

Optical waveguides

With optical coupler

Particular coupling function

385 27, 385 37, G02B 626

Patent

active

058870946

ABSTRACT:
A band-pass filter written into an optical waveguide includes at least one Bragg grating creating coupling between two propagation modes. In one version the pitch of the grating is equal to the length of beating of these two modes, to create codirectional coupling for the LP01 and LP0i modes. In another version the grating couples the LP01 mode to any contradirectional radiation mode. The filter includes, at one point at least of the grating, an area in which one half-period of the grating is omitted to create a phase-shift of .pi. between the two coupled modes.

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