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Improved apparatus and method with polarisation modulation for the reduction of polarisation-dependent selective amplification fading and / or polarization-dependent losses
Improved apparatus and method with polarisation modulation for the reduction of polarisation-dependent selective amplification fading and / or polarization-dependent losses
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机译:具有偏振调制的改进的装置和方法,用于减少偏振相关的选择性放大衰落和/或偏振相关的损耗
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摘要
The effects of polarization dependent hole burning and/or polarization dependent loss are reduced by modulating the state of polarization (SOP) of an arbitrarily polarized optical signal being launched into the transmission path periodically through a predetermined sequence of polarization states. The sequence of polarization states is selected such that on average the launched modulated signal excites substantially all possible polarization states with substantially equal probability, independent of the input SOP to the polarization modulator. In one exemplary embodiment, the SOP is modulated by a combination cascade of a rotating half-wave plate followed by a quarter-wave plate, which rotates at a different angular speed. In another exemplary embodiment, the SOP is modulated by a combination cascade of two variable phase retarders oriented at fixed angles of 0° and 45°, where the modulation frequencies of the two retarders are substantially different from each other.
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