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We investigate effects of pattern dependence in SPM-based all-optical regenerators for PDM signals as we vary relative delays between two orthogonal bit sequences. Up to 4-dB OSNR fluctuation may occur as the delay changes.
We report the experimental demonstration of an optical regenerator at 42.6 Gbit/s by using a self-phase-modulation-based pulse compressor and a self-phase-modulation-based regenerator. An improvement of the transmission distance is achieved.
All-optical 3R regeneration is demonstrated at 40 Gb/s that is wavelength-preserving and insensitive to the state of polarization of the input signal. The regenerator consists of retiming and reshaping stages that must be carefully co-designed.
Wavelength preserving 3R regeneration is demonstrated that is insensitive to the input signal state-of-polarization. Distributed Raman amplification is used to enhance cross-phase modulation and allows the retiming and reshaping stages to simultaneously achieve good performance.
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