New methods of multimode fiber interferometer signal processing

Oleg B. Vitrik; Yuri N. Kulchin; Oleg G. Maxaev; Oleg V. Kirichenko; Oleg T. Kamenev; Yuri S. Petrov

doi:10.1117/12.211854

14 June 1995 New methods of multimode fiber interferometer signal processing

Oleg B. Vitrik, Yuri N. Kulchin, Oleg G. Maxaev, Oleg V. Kirichenko, Oleg T. Kamenev, Yuri S. Petrov

Proceedings Volume 2544, Interferometry VII: Techniques and Analysis; (1995) https://doi.org/10.1117/12.211854
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

New methods of multimode fiber interferometers signal processing are suggested. For scheme of single fiber multimode interferometers with two excited modes, the method based on using of special fiber unit is developed. This unit provides the modes interaction and further sum optical field filtering. As a result the amplitude of output signal is modulated by external influence on interferometer. The stabilization of interferometer sensitivity is achieved by using additional special modulation of output signal. For scheme of single fiber multimode interferometers with excitation of wide mode spectrum, the signal of intermode interference is registered by photodiode matrix and then special electronic unit performs correlation processing. For elimination of temperature destabilization, the registered signal is adopted to multimode interferometers optical signal temperature changes. The achieved parameters for double mode scheme: temporary stability--0.6% per hour, sensitivity to interferometer length deviations--3,2 nm; for multimode scheme: temperature stability--(0.5%)/(K), temporary nonstability--0.2% per hour, sensitivity to interferometer length deviations--20 nm, dynamic range--35 dB.

Citation Download Citation

Oleg B. Vitrik, Yuri N. Kulchin, Oleg G. Maxaev, Oleg V. Kirichenko, Oleg T. Kamenev, and Yuri S. Petrov "New methods of multimode fiber interferometer signal processing", Proc. SPIE 2544, Interferometry VII: Techniques and Analysis, (14 June 1995); https://doi.org/10.1117/12.211854

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KEYWORDS

Interferometers

Signal processing

Modulation

Multimode fibers

Photodiodes

Optical filters

Capacitors

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