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随着光通信系统传输速率的提高,尤其是光分组交换网络的使用,光的相关检测技术将在未来的通信领域(包括IP路由等)中发挥越来越重要的作用。从基于光纤色散的光学相关器基本原理出发,采用理论分析和数值仿真两种方法比较了不同带宽光源对光学相关器性能的影响,分析了光源随机相位噪声向幅度噪声转化的问题,得到了幅度噪声与光源带宽的关系,以及光源带宽不同时光学相关器输出的信噪比变化。根据仿真结果得到,基于非相干光源的光学相关器,能对速率为10Gb/s的8位和16位码元数据流进行高速相关检测,而32位的码元数据流仅能采用相干光源进行检测。此外,还对非相干光源在模拟信号的相关检测中的应用进行了探讨。
With the increase of optical communication system transmission rate, especially the use of optical packet-switched networks, optical correlation detection technology will play an increasingly important role in the future of communications (including IP routing). Based on the basic principle of optical correlator based on optical fiber dispersion, theoretical analysis and numerical simulation are used to compare the effects of different bandwidth optical sources on the performance of optical correlator. The problem of random phase noise from source to amplitude-to-noise conversion is analyzed. The relationship between the noise and the light source bandwidth, and the change of the signal-to-noise ratio of the optical correlator output when the light source bandwidth is different. According to the simulation results, the optical correlator based on incoherent light source can detect 8-bit and 16-bit data streams at a rate of 10Gb / s for high-speed correlation, while the 32-bit data streams can only be processed by coherent light sources Detection. In addition, the application of non-coherent light sources in the correlation detection of analog signals is also discussed.