Optical isolator with low polarization mode dispersion

Details Optical isolator with low polarization mode dispersion Optical isolator with low polarization mode dispersion

1995-10-26

1996-09-17

Bovernick, Rodney B.

Optical waveguides

Polarization without modulation

385 15, 385 16, 385 74, 385140, 372703, 359 63, 359484, 359489, 359494, G02B 626, G02B 530, G02F 109

Patent

active

055576923

ABSTRACT:
The present invention provides for a compensating element in the form of a birefringent plate in an optical isolator which uses a first GRIN lens to collimate the light signal from an input optical fiber, a first birefringent polarizer wedge, an optical Faraday rotator, a second birefringent polarizer wedge, and a second GRIN lens to recollimate the light signal to an output optical fiber. Polarization mode dispersion through said optical isolator is substantially reduced by arranging the fast optical axis of the plate to be perpendicular to the fast optical axis of the polarizer on the same side of the Faraday rotator as the plate and selecting the thickness of the plate in a predetermined manner. The present invention also allows for minimization of "walk-off", which also contributes to some polarization mode dispersion through the isolator.

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