Optical directional coupler switch

Details Optical directional coupler switch Optical directional coupler switch

1990-02-28

1992-06-02

Gonzalez, Frank

Optical waveguides

Directional optical modulation within an optical waveguide

Electro-optic

385 11, 385 4, G02B 610

Patent

active

051194490

ABSTRACT:
An optical directional coupler switch is fabricated from a semiconductor substrate having a (111) plane. Thus, refractive indexes are changed for TE and TM modes by electrooptic effect, although the change amount is different between TE and TM modes. Therefore, a switching operation is realized for an incident light having any polarization. A device length L is preferrably set to meet an equation of "L.sub.TE .ltoreq.L.ltoreq.L.sub.TM " (L.sub.TE and L.sub.TM are coupling lengths for TE and TM modes) to decrease a cross-talk, even if the coupling lengths are different between TE and TM modes, considering that the difference is small.

REFERENCES:
patent: 4685763 (1987-08-01), Tada et al.
patent: 4711515 (1987-12-01), Alferness
patent: 4837526 (1989-06-01), Suzuki et al.
patent: 4861130 (1989-08-01), Katsuyama et al.
patent: 4884858 (1989-12-01), Ushikubo et al.

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