Field recovery via simplified carrier-assisted differential detection with interleaved subcarrier loading scheme at low CSPR condition

作者：He, Long; Yuan, Yangsheng; Cai, Yangjian; Li, Jianghao^*

来源：Optics Letters, 2023, 48(15): 4169-4172.

DOI：10.1364/OL.497215

• KRAMERS-KRONIG
• COHERENT
• MODULATION

In this Letter, we propose a simplified carrier-assisted differ-ential detection (CADD) receiver with interleaved subcarrier loading scheme to further reduce the system hardware com-plexity while preserving the capability of field recovery of double sideband (DSB) complex-valued signals at the low carrier to signal power ratio (CSPR) condition. The numer-ical results show that the simplified CADD receiver requires less gap subcarriers to achieve a bit-error-rate (BER) below the 7% hard-decision forward error correction (HD-FEC) limit of 3.8 x 10-3 as compared with a conventional CADD receiver. Despite the robustness to the time delay fluctua-tion decreases, which can be avoided using time-independent components in place of time delay line, more than a 3.2-dB optical signal-to-noise ratio (OSNR) gain can be obtained regardless of CSPR. & COPY; 2023 Optica Publishing Group