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We experimentally investigate filtering tolerance of 32-Gbaud DC-PDM-16QAM signals in 75-GHz-grid ROADM networks considering the trade-off between subcarrier-filtering and inter-subcarrier crosstalk.
For RF-pilot-assisted PDM-CO-OFDM systems, we propose and demonstrate a carrier recovery method applying a simple moving average filter (MAF) to extract the central RF-pilot for phase noise compensation. Because only two additions per output sample would be required to implement such a MAF, its computational complexity is rather simple compared to any other direct-form finite impulse response (FIR)...
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