Optical switch with reduced polarization dependency and no wavef

Details Optical switch with reduced polarization dependency and no wavef Optical switch with reduced polarization dependency and no wavef

1997-04-10

1999-03-16

Ben, Loha

Optical: systems and elements

Optical modulator

Light wave directional modulation

359305, 359285, 372703, 372 32, G02F 129

Patent

active

058837345

ABSTRACT:
An optical switch is formed by: at least one switch driving circuit for generating ultrasonic waves; at least one electric acousto-optic element forming at least one diffraction grating therein upon being applied with the ultrasonic waves generated by the switch driving circuit; at least one polarization rotator for rotating a polarization plane of a first primary diffracted light produced by the diffraction grating, by 90.degree.; and a light path through which an input light is entered into the electric acousto-optic element at a Bragg angle of the diffraction grating in a first direction side, the first direction being defined as either identical or opposite to a propagation direction of the ultrasonic waves, so that the first primary diffracted light is produced by the diffraction grating from the input light, a polarization plane rotated light produced by the polarization rotator is entered into the electric acousto-optic element at a Bragg angle of the diffraction grating in a second direction side, the second direction being opposite to the first direction, and a second primary diffracted light produced by the diffraction grating from the polarization plane rotated light is outputted as an output light.

REFERENCES:
patent: 4736382 (1988-04-01), O'Meara
patent: 4784473 (1988-11-01), Gookin
patent: 5107368 (1992-04-01), Noguchi
patent: 5191339 (1993-03-01), Riza
patent: 5281907 (1994-01-01), Hartup et al.

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