We experimentally demonstrate a rate-adaptive concatenated forward error correction (FEC) scheme to minimize the information rate loss due to varying channel conditions. The concatenated coding scheme is based on inner soft-decision polar code and outer hard-decision staircase code. An experiment in a wavelength-division multiplexed (WDM) system with different SNR per WDM channel is performed by employing concatenated codes with various coded modulation schemes over a target distance of 140km which is relevant for extending the reach of data center interconnects. Experimental results show that the achieved data rate of the WDM system can be improved up to 37.6% with the proposed coding scheme w.r.t. the fixed code rate ZR FEC.

中文翻译：

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灵活光网络速率自适应级联码的实验演示

我们通过实验证明了一种速率自适应级联前向纠错 (FEC) 方案，以最大限度地减少由于信道条件变化引起的信息速率损失。级联编码方案是基于内部软判决极化码和外部硬判决阶梯码。通过在 140 公里的目标距离上采用具有各种编码调制方案的级联码，在与扩展数据中心互连范围相关的波分复用 (WDM) 系统中进行了一项实验。实验结果表明，采用所提出的编码方案与固定码率 ZR FEC 相比，WDM 系统实现的数据速率可提高 37.6%。