USA As Represented by Secretary of the Navy

Irt N Duling, Iii

William K Burns

Robert P Moeller

Michael L Dennis

An optical method and apparatus particularly useful as an intensity modulation system, in which two phase modulators are placed in the loop of a Sagnac interferometer. Selective placement of the modulators, and the amplitude of any modulation signal input to the modulators, varies the bandwidth and frequency response of the system. In a preferred embodiment, the ratio of the optical distances of the modulators from interferometric midpoint, and the ratio of modulation signal amplitudes, is about 3:1, which serves to broaden and flatten the frequency response of the system.

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Round Hill, VA, United States of America

Irt N Duling, Iii