Interrogation of a Birefringent Fiber Sensor by Nonreciprocal Phase Modulation

The technique of nonreciprocal phase modulation, known from Sagnac-type interferometers, is adopted to interrogate the differential phase shift of the orthogonal light waves in a birefringent fiber sensor. The sensing section of the novel interferometer consists of a series of two birefringent fiber...

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Veröffentlicht in:IEEE photonics technology letters 2010-09, Vol.22 (18), p.1388-1390
Hauptverfasser: Wildermuth, S, Bohnert, K, Brandle, H
Format: Artikel
Sprache:eng
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Zusammenfassung:The technique of nonreciprocal phase modulation, known from Sagnac-type interferometers, is adopted to interrogate the differential phase shift of the orthogonal light waves in a birefringent fiber sensor. The sensing section of the novel interferometer consists of a series of two birefringent fibers with balanced differential group delay. A key element is a 45°-Faraday rotator which swaps the polarization states of the orthogonal waves after their round trip through the two fiber sections. An integrated-optic birefringent phase modulator introduces the nonreciprocal phase modulation at the detector end of the sensor. The interferometer is applied to voltage sensing.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2010.2060321