Article comprising a Bragg reflective Mach-Zehnder filter of red

Details Article comprising a Bragg reflective Mach-Zehnder filter of red Article comprising a Bragg reflective Mach-Zehnder filter of red

1997-10-15

1999-03-30

Sanghavi, Hemang

Optical waveguides

Directional optical modulation within an optical waveguide

Electro-optic

385 3, 385 37, 359130, G02F 1295, G02B 634

Patent

active

058898999

ABSTRACT:
A Brag reflective Mach-Zehnder filter has arms that introduce a .pi. phase difference in transmission but not in reflection. In one embodiment a .pi. phase difference is introduced in one of the two arms between the Bragg grating and one of the couplers. In another embodiment, a phase difference of .pi./2 is introduced in one arm both before and after the grating and the location of the grating in the other arm is shifted. The transmission of the resulting filter is substantially independent of the degree of coupling at the input and the output. WDM systems employing the new filters are also disclosed.

REFERENCES:
patent: 5502782 (1996-03-01), Smith
patent: 5581642 (1996-12-01), Deacon et al.
patent: 5636309 (1997-06-01), Henry et al.
patent: 5793908 (1998-08-01), Mizuochi et al.

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