In this article, the performance of a fixed grid network is examined for various modulation formats to estimate the system's capacity and spectral efficiency. The optical In-phase Quadrature Modulator structure is used to build a fixed grid network modulation, and the homodyne detection approach is used for the receiver. Data multiplexing is accomplished using the Polarization Division Multiplexed technology. 100 Gbps, 150 Gbps, and 200 Gbps data rates are transmitted under these circumstances utilizing various modulation formats. Various pre-processing and signal recovery steps are explained by using modern digital signal processing systems. The achieved spectrum efficiencies for PM-QPSK, PM-8 QAM, and PM-16 QAM, respectively, were 2, 3, and 4 bits/s/Hz. Different modulation like PM-QPSK, PM-8-QAM, and PM-16-QAM each has system capacities of 8-9, 12-13.5, and 16-18 Tbps and it reaches transmission distances of 3000, 1300, and 700 kilometers with acceptable Bit Error Rate less than equal to 2*10-3 respectively. Peak optical power for received signal detection and full width at half maximum is noted for the different modulations under a fixed grind network.

翻译：本文研究了固定网格网络在不同调制格式下的性能，以估算系统容量和频谱效率。采用光学同相正交调制器结构构建固定网格网络调制，并在接收端使用零差探测方法。数据复用通过偏振分复用技术实现。在此条件下，利用多种调制格式分别传输100 Gbps、150 Gbps和200 Gbps的数据速率。通过现代数字信号处理系统阐述了各种预处理和信号恢复步骤。PM-QPSK、PM-8QAM和PM-16QAM的频谱效率分别达到2、3和4 bits/s/Hz。不同调制格式如PM-QPSK、PM-8QAM和PM-16QAM的系统容量分别为8-9、12-13.5和16-18 Tbps，在误码率不超过2×10⁻³的可接受条件下，对应传输距离分别达到3000、1300和700公里。还记录了固定网格网络下不同调制格式接收信号检测的峰值光功率和半高全宽参数。