引入4D几何壳整形以缓解非线性干扰噪声
Introducing 4D Geometric Shell Shaping for Mitigating Nonlinear Interference Noise
AI总结：
提出4D-GSS方法以缩小非线性引起的整形间隙，在400ZR兼容设置下相比PM-16QAM等格式提升了非线性容忍度与传输距离，并提供了低复杂度可扩展的4D调制格式设计框架。
摘要：
引入了四维几何壳整形（4D-GSS）作为缩小由非线性引起的整形间隙的方法。该格式设计在8 b/4D-sym的频谱效率下，并在具有大量非线性的400ZR兼容传输设置中与偏振复用16QAM（PM-16QAM）和概率整形PM-16QAM（PS-PM-16QAM）进行比较。以可达信息速率和FEC后误码率评估传输距离增加和非线性容忍度。单跨距、单信道数值仿真表明，针对比特度量解码（RBMD）进行优化时，4D-GSS相比PM-16QAM和PS-PM-16QAM实现了更高的非线性容忍度和传输距离增加。就RBMD而言，增益较小，与PM-16QAM相比传输距离增加1.7%。当针对互信息进行优化时，相比PM-16QAM实现了3%的更大传输距离增加。此外，引入的GSS方案为设计结构良好且低复杂度的4D调制格式提供了可扩展框架。
英文摘要：
Four dimensional geometric shell shaping (4D-GSS) is introduced as an approach for closing the nonlinearity-caused shaping gap. This format is designed at the spectral efficiency of 8 b/4D-sym and is compared against polarization-multiplexed 16QAM (PM-16QAM) and probabilistically shaped PM-16QAM (PS-PM-16QAM) in a 400ZR-compatible transmission setup with high amount of nonlinearities. Reach increase and nonlinearity tolerance are evaluated in terms of achievable information rates and post-FEC bit-error rate. Numerical simulations for a single-span, single-channel show that 4D-GSS achieves increased nonlinear tolerance and reach increase against PM-16QAM and PS-PM-16QAM when optimized for bit-metric decoding (RBMD). In terms of RBMD, gains are small with a reach increase of 1.7% compared to PM-16QAM. When optimizing for mutual information, a larger reach increase of 3% is achieved compared to PM-16QAM. Moreover, the introduced GSS scheme provides a scalable framework for designing well-structured 4D modulation formats with low complexity.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
