Opt Lett. 2023 May 1;48(9):2237-2240. doi: 10.1364/OL.487469.
A receive-diversity-aided power-fading compensation (RDA-PFC) scheme is proposed and demonstrated to eliminate the chromatic dispersion (CD)-induced power fading for C-band double-sideband (DSB) intensity modulation and direct detection (IM/DD) orthogonal frequency division multiplexing (OFDM) systems. By combining the responses before and after a dispersive element using a maximal-ratio combining (MRC) algorithm, the CD-induced power fading dips within the signal bandwidth of around 50 GHz can be effectively compensated for, which results in an up to 17.6-dB signal-to-noise ratio (SNR) improvement for the fading subcarriers after transmission over 10 km of standard single-mode fiber (SSMF). Using the 16 quadrature amplitude modulation (QAM) format, a diversity receiver with the proposed RDA-PFC scheme can support 170.6-Gbit/s OFDM signal transmission over a 10-km SSMF and reduces the bit error rate (BER) by more than an order of magnitude compared with a conventional receiver. Moreover, 208.1-Gbit/s adaptive bit and power loading OFDM signal transmission over a 10-km SSMF is realized by the proposed RDA-PFC scheme, which improves the capacity by 15.3% compared with the case without RDA-PFC at a BER of 3.8 × 10. The proposed RDA-PFC scheme shows great potential in CD-induced power-fading compensation for high-speed IM/DD OFDM systems.
提出并演示了一种接收分集辅助功率衰落补偿（RDA-PFC）方案，用于消除 C 波段双边带（DSB）强度调制和直接检测（IM/DD）正交频分复用（OFDM）系统中由色度色散（CD）引起的功率衰落。通过使用最大比合并（MRC）算法组合色散元件前后的响应，可以有效地补偿 CD 引起的功率衰落，从而使衰落子载波的信号噪声比（SNR）提高 17.6dB，传输距离超过 10km 的标准单模光纤（SSMF）。使用 16 正交幅度调制（QAM）格式，具有所提出的 RDA-PFC 方案的分集接收器可以支持 170.6Gbit/s 的 OFDM 信号传输，在 10km 的 SSMF 上传输，与传统接收器相比，误码率（BER）降低了一个数量级以上。此外，通过所提出的 RDA-PFC 方案实现了 10km SSMF 上 208.1Gbit/s 的自适应比特和功率加载 OFDM 信号传输，与没有 RDA-PFC 的情况相比，在 BER 为 3.8×10^-3 时，容量提高了 15.3%。所提出的 RDA-PFC 方案在高速 IM/DD OFDM 系统的 CD 诱导功率衰落补偿中具有很大的潜力。
