Spectral-Efficient Subcarrier Loading Scheme for Field Recovery via Simplified Carrier-Assisted Differential Detection at Low CSPR Condition

In this paper, we propose a spectral-efficient subcarrier loading scheme for simplified carrier-assisted differential detection (CADD) receiver. Our simulation results show that the simplified CADD receiver with the proposed subcarrier loading scheme requires fewer null subcarriers to achieve the reference bit-error-rate (BER) of 7% hard-decision forward error correction (HD-FEC) limit, which can increase the SE by 10% to the maximum extent as compared to the one with interleaved subcarrier loading scheme. In addition, more than 13dB optical signal-to-noise ratio (OSNR) gain regardless of CSPR and enhanced robustness to the time delay fluctuation can be obtained with the proposed subcarrier loading scheme. © 2024 Optica Publishing Group