Method and System for High-Speed and High-Resolution Linearized Optical Frequency Discriminator

Abstract: a method of linearizing an output of an interferometer includes: obtaining an optical signal from a laser at an input of the interferometer; converting, with a first photodiode connected to an optical through-port of the interferometer and a second photodiode connected to an optical cross-port of the interferometer, a detected optical intensity of the optical signal at the optical through-port and the optical cross-port into two photocurrents using self-homodyne detection; providing the two photocurrents to a logarithmic ratio amplifier to determine a logarithmic ratio of the two photocurrents; processing the logarithmic ratio by scaling the logarithmic ratio and introducing a dc output offset voltage to provide an output voltage; and compensating for the dc output offset voltage using a differential buffer amplifier connected to the output of the logarithmic ratio amplifier to provide a dc output voltage that corresponds to a linearized output of the interferometer.

Inventor(s): Suhas Bhandare, Jorge Perdomo

CPC Classification: H01S3/137 (DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL)

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