Abstract In this paper, we propose a statistical adaptive derivative equalizer (SADE) in order to reduce an optical beat interference (OBI) noise in an optical access link. The proposed SADE generates an output signal similar to the shape of the input pulse amplitude modulation (PAM)-4 signal waveform, which is implemented as an adaptive total variation that responds to the shape of the multi-step signal waveform with the weighting function considering the Lorentzian characteristics of the OBI noise. We implement a 20-km optical link and measure the bit error rate (BER) and signal to noise ratio (SNR) to see if the OBI noise was reduced using the proposed technique. A 1.5-dB SNR gain was observed over the overall SNR range of received PAM-4 signal than that without the use. A power penalty in the case of using only SADE was improved by 1.5 dB at 7% forward error correction (FEC) limit compared to that without the SADE. Furthermore, when the proposed SADE and matched filter were applied simultaneously, about 2.5-dB power penalty was observed at the 7% FEC limit.

中文翻译：

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使用统计自适应微分均衡器减少光拍频干扰噪声

摘要 在本文中，我们提出了一种统计自适应微分均衡器（SADE），以减少光接入链路中的光拍频干扰（OBI）噪声。所提出的 SADE 生成类似于输入脉冲幅度调制 (PAM)-4 信号波形的形状的输出信号，该输出信号被实现为自适应总变差，该总变差响应具有加权函数的多步信号波形的形状考虑OBI 噪声的洛伦兹特性。我们实施了一条 20 公里的光链路并测量了误码率 (BER) 和信噪比 (SNR)，以查看使用所提出的技术是否降低了 OBI 噪声。在接收到的 PAM-4 信号的整个 SNR 范围内观察到 1.5 dB SNR 增益，而不是未使用的。仅使用 SADE 的情况下的功率损失提高了 1。与没有 SADE 的情况相比，前向纠错 (FEC) 限制为 7% 时为 5 dB。此外，当建议的 SADE 和匹配滤波器同时应用时，在 7% FEC 限制下观察到大约 2.5-dB 的功率损失。