Optical switches, modulators and transmitters

Details Optical switches, modulators and transmitters Optical switches, modulators and transmitters

1997-10-31

1999-10-19

Sanghavi, Hemang

Optical waveguides

Temporal optical modulation within an optical waveguide

Electro-optic

385 6, 385 8, 385 16, 359183, 359187, 359188, G02F 1035, H04B 1004

Patent

active

059701854

ABSTRACT:
An optical interferometer incorporating a signal strength modulated optical phase delay, such as a Kerr effect element in one of its arms is employed to improve the cross-talk isolation/extinction ratio of an optical switch, amplitude modulator, or amplitude modulated optical transmitter. The Kerr element is constructed so that its intensity dependent optical path length is such as to provide destructive interference at the interferometer output when the light input to the interferometer is low, and constructive interference when the input is high. The place of the Kerr effect element can alternatively be taken by an electro-optic modulator driven with an electrical version of the data modulation appearing on the optical signal.

REFERENCES:
patent: 5056885 (1991-10-01), Chinn
patent: 5247594 (1993-09-01), Okuno et al.
patent: 5278923 (1994-01-01), Nazarathy et al.
patent: 5377284 (1994-12-01), Bulow
patent: 5703975 (1997-12-01), Miller et al.
patent: 5710653 (1998-01-01), Nemecek et al.

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