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We improve the encoding/decoding of polarization-switched QPSK (PS-QPSK) to enhance the performance, and show that QPSK-based modified phase-conjugated twin wave is similar to the improved PS-QPSK but provides additional gain via fiber nonlinearity mitigation.
We propose a block line-coding scheme that uses prior information about the distortion mechanism for reducing timing jitter in WDM return-to-zero (RZ) systems, and we demonstrate its effectiveness using simulations.
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