Passive Homodyne Optical Grating Demodulator: Principles And Performance

J. T. Freidah; R. F. Cahill; A. A. Joseph; H. B. Turner; S. A. Holmes; R. E. Wagoner

doi:10.1117/12.949774

3 January 1986 Passive Homodyne Optical Grating Demodulator: Principles And Performance

J. T. Freidah, R. F. Cahill, A. A. Joseph, H. B. Turner, S. A. Holmes, R. E. Wagoner

Proceedings Volume 0566, Fiber Optic and Laser Sensors III; (1986) https://doi.org/10.1117/12.949774
Event: 29th Annual Technical Symposium, 1985, San Diego, United States

Abstract

This paper describes the current status of a passive homodyne demodulator useful for extracting an optical phase signal from a fiber interferometric sensor. An optical demodulator has been developed in conjunction with a sine-cosine electrical demodulator that has a noise floor of a few prad/iffi. This passive homodyne detection has the advantage over other homodyne detection schemes in that it eliminates the need for active feedback phase modulators. The sensitivities achieved are relatively flat over a wide frequency band and temperature range. Comparisons with alternative approaches and discussions of performance data will be presented.

Citation Download Citation

J. T. Freidah, R. F. Cahill, A. A. Joseph, H. B. Turner, S. A. Holmes, and R. E. Wagoner "Passive Homodyne Optical Grating Demodulator: Principles And Performance", Proc. SPIE 0566, Fiber Optic and Laser Sensors III, (3 January 1986); https://doi.org/10.1117/12.949774

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