论文标题
引入4D几何外壳成型，以减轻非线性干扰噪声
Introducing 4D Geometric Shell Shaping for Mitigating Nonlinear Interference Noise
论文作者
论文摘要
引入了四维几何壳体形状（4D-GSS），作为缩小非线性引起的塑形间隙的一种方法。该格式以8 b/4d-sym的光谱效率进行设计，并与极化的16QAM（PM-16QAM）和概率形状形状的PM-16QAM（PS-PM-16QAM）进行比较，并具有400ZR兼容的透射设置，具有高度的非线性。根据可实现的信息率和FEC Bit-Error率来评估覆盖范围的增加和非线性公差。单跨度单通道的数值模拟表明，当对位 - 金属解码（RBMD）优化时，4D-GSS可提高非线性耐受性并增加对PM-16QAM和PS-PM-16QAM的增加。就RBMD而言，与PM-16QAM相比，增益较小，达到1.7％。当优化互信息时，与PM-16QAM相比，较大的达到3％。此外，引入的GSS方案提供了一个可扩展的框架，用于设计结构良好的4D调制格式，其复杂性低。
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.
