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Optical Engineering

Influence of polarization-dependent crosstalk on scale factor in the in-line Sagnac interferometer current sensor
Author(s): Jia Yu; Chunxi Zhang; Chuansheng Li; Xiaxiao Wang; Yan Li; Xiujuan Feng
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Paper Abstract

The scale factor of the in-line Sagnac interferometer current sensor associated with the polarization-dependent crosstalk introduced by optical devices is theoretically investigated. The variations of output pigtail polarization crosstalk of the Ti-indiffused LiNbO 3 phase modulator and polarization crosstalk of the polarization-maintaining (PM) delay optical fiber with the temperature can lead to the scale-factor error. The white-light interferometry is utilized to measure the pigtail polarization crosstalk of the phase modulator. The variation of the scale factor with the temperature has been tested over a range from −40°C to 60°C experimentally. The results confirm the influence of output pigtail polarization crosstalk of phase modulator and polarization crosstalk of the PM delay optical fiber on the scale factor. To ensure the scale factor error to be within ±0.2% , the output pigtail polarization crosstalk of phase modulator and polarization crosstalk of the PM delay optical fiber should not exceed −30  dB for the current sensor operating in the outdoor environment.

Paper Details

Date Published: 5 November 2013
PDF: 11 pages
Opt. Eng. 52(11) 117101 doi: 10.1117/1.OE.52.11.117101
Published in: Optical Engineering Volume 52, Issue 11
Show Author Affiliations
Jia Yu, BeiHang Univ. (China)
Chunxi Zhang, BeiHang Univ. (China)
Chuansheng Li, BeiHang Univ. (China)
Xiaxiao Wang, BeiHang Univ. (China)
Yan Li, BeiHang Univ. (China)
Xiujuan Feng, BeiHang Univ. (China)


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