Direct-alignment and direct-detection optical communication system and method based on module multiplexing

Abstract

The invention discloses a direct-alignment and direct-detection optical communication system and method based on module multiplexing. The system comprises N optical signal modulation units used for generating N optical signals modulated by a submodule; the N light amplification units are used for amplifying light signals; the N first mode conversion units are used for obtaining optical signals of N channels with different modes; the mode multiplexing unit is used for synthesizing the optical signals of the N paths of different mode channels into a first multiplexing mode optical signal; the N module demodulation modules are used for respectively carrying out demodulation and mode conversion on N modules in the optical signals output by the communication optical fiber, respectively obtaining Mi paths of mutually orthogonal mode modulated optical signals corresponding to each module and synthesizing the Mi paths of mutually orthogonal mode modulated optical signals into second multiplexing mode optical signals; and the N photoelectric detectors are used for converting the second multiplexing mode optical signal into an electric signal. The transmission performance and the stability of the system are improved, the cost is low, the scheme is simple, and the universality is high. 本发明公开了一种基于模组复用的直调直检光通信系统及方法，系统包括：用于生成N路基模调制的光信号的N个光信号调制单元；用对光信号进行放大的N个光放大单元；用于得到N路不同模式信道的光信号的N个第一模式转换单元；用于将N路不同模式信道的光信号合成第一复用模式光信号的模式复用单元；用于将由通信光纤输出后的光信号中的N个模组分别进行解调以及模式转换，对应每个模组分别得到Mi路相互正交模式调制的光信号并合成第二复用模式光信号的N个模组解调模块；用于将第二复用模式光信号转换为电信号的N个光电探测器。本发明提高了系统的传输性能与稳定性，且成本低、方案简单、通用性强。