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Appl Opt. 2013 Jun 20;52(18):4353-9. doi: 10.1364/AO.52.004353.

Self-adaptive demodulation for polarization extinction ratio in distributed polarization coupling.

Author information

  • 1College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin, China. hxzhang@tju.edu.cn


A self-adaptive method for distributed polarization extinction ratio (PER) demodulation is demonstrated. It is characterized by dynamic PER threshold coupling intensity (TCI) and nonuniform PER iteration step length (ISL). Based on the preset PER calculation accuracy and original distribution coupling intensity, TCI and ISL can be made self-adaptive to determine contributing coupling points inside the polarizing devices. Distributed PER is calculated by accumulating those coupling points automatically and selectively. Two different kinds of polarization-maintaining fibers are tested, and PERs are obtained after merely 3-5 iterations using the proposed method. Comparison experiments with Thorlabs commercial instrument are also conducted, and results show high consistency. In addition, the optimum preset PER calculation accuracy of 0.05 dB is obtained through many repeated experiments.

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