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We demonstrate real-time CD equalization (CDE) for coherent optical transmission systems using a low complexity time-domain (TD) multiplierless finite-impulse response (FIR)-based equalizer, based on a field-programmable gate array (FPGA) implementation. The real-time operation is performed for a single-channel 2.5 Gb/s QPSK optical signal with a performance penalty of only ∼0.15 dB with respect to...
We report a hardware optimization for frequency and phase recovery algorithms based on Mth-order power schemes, evaluating the accuracy of the reported architecture with an 8-bit DSP in real-time for a 1.25 and 2.5 Gb/s DQPSK signal.
We experimentally demonstrate in real-time mode operation the coexistence of a digital coherent PON architecture based on UDWDM QPSK with a NGPON2 system based on TWDM OOK. Using simple DSP-based ONU, guard bands of 100 GHz are achieved.
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