Electrooptical amplitude modulator

Details Electrooptical amplitude modulator Electrooptical amplitude modulator

1975-02-25

1976-05-18

Corbin, John K.

350 96C, G02B 514

Patent

active

039573400

ABSTRACT:
An optical waveguide system for transforming the output of a phase modulator into an amplitude modulation. Laser light propagating in the waveguide is forwarded into branches in the waveguide. An electrooptic material placed in one or more branches is electrically controlled to vary the phase in each branch causing different propagation modes. The branched optical radiation or coherent light is then recombined in a single branch and subsequently branched again with each subsequent branch propagating a different mode. By tapering one of the latter branches to zero thickness, selective modes can be blocked resulting in amplitude modulation.

REFERENCES:
patent: 3465159 (1969-09-01), Stern
patent: 3610727 (1971-10-01), Ulrich
Yajima, "Dielectric Thin Film Optical Branching Waveguide," Applied Physics etters, Vol. 22, No. 12, June 15, 1973, pp. 647-649.

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