论文标题
在存在激光相噪声的情况下，二维星座的几何形状
Geometric Shaping of 2-Dimensional Constellations in the Presence of Laser Phase Noise
论文作者
论文摘要
在本文中，我们提出了一种几何形状（GS）策略，以设计8、16、32和64-ARY调制格式，以损害添加剂白色高斯（AWGN）和相位噪声，为光纤通道损害了光纤通道。优化了星座，以使用错配通道模型最大化广义相互信息（GMI）。与其正交振幅调制（QAM）或AWGN优化的对应物相比，提出的格式在高相噪声方面表现出增强的信噪比（SNR）的耐受性。通过将优化置于400ZR实施协议的背景下，我们表明单独使用GB的激光线宽（LW）或载体相位估计（CPE）的要求（CPE）的要求为400 GBIT/S传输链接及以后。在GMI验证之后，根据400ZR实施协议，根据实施的软决策（SD）扩展锤式法规（128，120）来检查提出格式的性能（FEC）BIT-ERROR率（FEC）比特纠正率（BER）。与64-ARY AWGN形状格式相比，我们证明了高达1.2 dB的收益。
In this paper, we propose a geometric shaping (GS) strategy to design 8, 16, 32 and 64-ary modulation formats for the optical fibre channel impaired by both additive white Gaussian (AWGN) and phase noise. The constellations were optimised to maximise generalised mutual information (GMI) using a mismatched channel model. The presented formats demonstrate an enhanced signal-to-noise ratio (SNR) tolerance in high phase noise regimes when compared with their quadrature amplitude modulation (QAM) or AWGN-optimised counterparts. By putting the optimisation results in the context of the 400ZR implementation agreement, we show that GS alone can either relax the laser linewidth (LW) or carrier phase estimation (CPE) requirements of 400 Gbit/s transmission links and beyond. Following the GMI validation, the performance of the presented formats was examined in terms of post forward error correction (FEC) bit-error-rate (BER) for a soft decision (SD) extended Hamming code (128, 120), implemented as per the 400ZR implementation agreement. We demonstrate gains of up to 1.2 dB when compared to the 64-ary AWGN shaped formats.
