Polarization independent optical switches

Details Polarization independent optical switches Polarization independent optical switches

1990-01-04

1991-03-05

Ullah, Akm

350 9613, G02B 610

Patent

active

049972456

ABSTRACT:
An electrooptical device comprises a substrate of electrooptic material having first, second and third optical waveguide formed therein. The first and second waveguides have first and second waveguide segments respectively, and the third waveguide has third and fourth waveguide segments extending adjacent the first and second waveguide segments respectively, so that first and second directional couplers are formed. The interaction length of the first directional coupler is slightly greater than an optimum interaction length for a predetermined wavelength and the interaction length of the second directional coupler is slightly less than an optimum interaction length for the predetermined wavelength. A first electrode structure influences the first directional coupler and a second electrode structure influences the second directional coupler. Potentials can be applied to the first and second electrode structures such that for the predetermined wavelength first and second states of the device can be established in which polarized light is propagated from one end of the first waveguide to one end of the second waveguide with higher and lower transmissions respectively and the transmission in the first state is substantially independent of the polarization eigen state.

REFERENCES:
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Y. Tanisawa et al., "Low Crosstalk and Polarization Independent Ti:LiNbO.sub.3 Optical Waveguide Switch for OTDR", Proceedings, Conference on Integrated and Guided Wave Optics, 240 (1988).
L. McCaughan, "Low-Loss Polartization-Independent Electrooptical Switches at .lambda.=1.3 .mu.m", IEEE J. Lightwave Tech., LT-2, 51 (1984).

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