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Published on: March 20, 2017
Residual-carrier-aided coherent-lite receiver for wide-linewidth links using low-complexity DD-ML phase tracking
Abstract:
This Letter demonstrates a residual-carrier-aided coherent-lite receiver for short-reach links. Residual-carrier-based recovery smooths laser phase noise, enabling a lightweight symbol-wise decision-directed maximum-likelihood (DD-ML) tracker to replace blind phase search (BPS). The post-recovery channel is quasi-linear time-invariant (quasi-LTI), so a short 4×1 MIMO sized to the dispersion memory suffices with no frequency-domain chromatic-dispersion compensation (CDC). In a dual-subcarrier 90-Gbaud PDM-16QAM transmission over 25-km SSMF with Tx linewidths of 100 kHz and 9 MHz and a ∼12.3-MHz LO, minimum BERs are 2.2×10-3 and 1.4×10-2, respectively. DD-ML preserves BER while markedly reducing carrier-phase-recovery complexity, enabling cost-effective coherent interconnects with wide-linewidth lasers.
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