Hoechst Celanese Corporation

Donald Raskin

Gordon W Calundann

Hyun-Nam Yoon

Anthony J East

James B Stamatoff

Alan Buckley

Garo Khanarian

Kophu Chiang

A system incorporating a pair of Mach-Zehnder modulators (164,166) for performing amplitude modulation of an optical carrier is disclosed. Each of the modulators is designed to suppress even order distortion products and develop third order distortion products of opposite sign and equal magnitude. The outputs of the two modulators are combined in a directional coupler (155) resulting in substantially suppressing second through fourth order distortion products.

Cable system incorporating highly linear optical modulator

In a preferred embodiment this invention provides a second order nonlinear optical film medium which consists of a thermoplastic copolymer which has a crystallographic molecular alignment, and a net dipolar molecular orientation normal to the film plane. The crystallographic molecular alignment is formed by axial mechanical stressing, and the dipolar molecular orientation is induced by an electric or magnetic field. Illustrative of an invention polymer is a copolymer of vinylidene fluoride and 4-[N-(10-methacroyloxydecyl)]-4'-nitrostilbene: ##STR1##

Copolymeric nonlinear optical media

In one embodiment this invention provides a polarization-insensitive interferometric waveguide electrooptic modulator device. In a Mach-Zender type of waveguide geometry, each of the divergent optical paths has a set of electrodes, one of which applies a horizontal electric field and the other a vertical electrical field, respectively, to a nonlinear optically responsive polymeric medium in the optical paths. The polymer medium section between each set of electrodes has a noncentrosymmetric molecular orientation parallel to the respective electric fields.

Polarization-insensitive interferometric waveguide electrooptic modulator

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Bronx, NY, United States of America

Donald Raskin