11 November 2008 The least DOFs required for a polarization controller in PMD compensator
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Proceedings Volume 7134, Passive Components and Fiber-based Devices V; 713425 (2008) https://doi.org/10.1117/12.803279
Event: Asia-Pacific Optical Communications, 2008, Hangzhou, China
Abstract
Automatically controlled polarization controllers (PC) are the essential integral parts in an automatic compensator for polarization mode dispersion (PMD). It is suggested by Prof. M. Karsson et al. at Charlmers University of Technology, and afterward widely accepted that we need to adjust only two waveplate PC (two degrees of freedom, DOF) for each stage PMD compensator to complete PMD compensation. It is equivalent to say that only two of degrees of freedom for each PC are needed to complete the state of polarization (SOP) transformation from any input state into any other state covering the entire Poincare Sphere. In this paper will take two types of commercial available PC as examples to prove theoretically and experimentally that except for the reset-free problem it is necessary to adjust at least three instead of two waveplates in order to transform any input state into any other state covering the entire Poincare Sphere. Therefore we can achieve complete PMD compensation at least using 3 DOF instead 2 PC in each stage PMD compensator.
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Xiaoguang Zhang, Gaoyan Duan, Lixia Xi, "The least DOFs required for a polarization controller in PMD compensator", Proc. SPIE 7134, Passive Components and Fiber-based Devices V, 713425 (11 November 2008); doi: 10.1117/12.803279; https://doi.org/10.1117/12.803279
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