In this paper, a 64-channel Nyquist-DWDM system has been proposed for spectral-efficient long-haul optical interconnects. Dual-polarization 16-QAM has been used at each transmitter, and the homodyne detection technique decodes the transmitted symbols at the receiver. Gray code used in the transmitters shows an improved OSNR tolerance, receiver sensitivity, and transmission distance in comparison to the differential code. Erbium-doped fiber amplifiers compensate for attenuation at regular intervals in the multi-span transmission line. Digital signal processing techniques with advanced algorithms compensate for the signal impairments after demodulation. The transceiver performance has been analyzed through comprehensive numerical methods for the 25 GHz and 50 GHz DWDM grids. The system performance has been optimized considering various parameters such as laser power, linewidth, crosstalk, OSNR tolerance, and receiver sensitivity. The transceiver achieves 7.68 Tbps data rate over a transmission distance of 3100 km and 2650 km for the considered DWDM grids, respectively. The gray-coded system possesses an OSNR tolerance of 16.4 dB and the overall DWDM system spectral efficiency of 4.71 b/s/Hz at its maximum transmission distance. This super-channel transceiver shall be helpful in high-capacity long-haul transmission and backbone support to the existing network infrastructure.

在本文中，提出了一种 64 通道 Nyquist-DWDM 系统，用于实现光谱高效的长距离光互连。每个发射器都使用了双极化 16-QAM，零差检测技术在接收器处对发射的符号进行解码。与差分代码相比，发射器中使用的格雷码显示出改进的 OSNR 容差、接收器灵敏度和传输距离。掺铒光纤放大器以固定间隔补偿多跨传输线中的衰减。采用先进算法的数字信号处理技术可补偿解调后的信号损伤。收发器性能已通过 25 GHz 和 50 GHz DWDM 网格的综合数值方法进行了分析。系统性能经过优化，考虑了各种参数，例如激光功率、线宽、串扰、OSNR 容差和接收器灵敏度。对于所考虑的 DWDM 网格，收发器在 3100 公里和 2650 公里的传输距离上分别实现了 7.68 Tbps 的数据速率。格雷编码系统在其最大传输距离处具有 16.4 dB 的 OSNR 容差和 4.71 b/s/Hz 的整体 DWDM 系统频谱效率。这种超信道收发器将有助于大容量长距离传输和对现有网络基础设施的骨干支持。格雷编码系统在其最大传输距离处具有 16.4 dB 的 OSNR 容差和 4.71 b/s/Hz 的整体 DWDM 系统频谱效率。这种超信道收发器将有助于大容量长距离传输和对现有网络基础设施的骨干支持。格雷编码系统在其最大传输距离处具有 16.4 dB 的 OSNR 容差和 4.71 b/s/Hz 的整体 DWDM 系统频谱效率。这种超信道收发器将有助于大容量长距离传输和对现有网络基础设施的骨干支持。