论文部分内容阅读
光采样耦合技术是全光多输入多输出（optical multi-input multi-output, optical MIMO）信号处理中的关键技术。其中，模式相关损耗（mode dependent loss, MDL）和插入损耗（insertion loss, IL）是影响器件性能的关键因素，矩阵条件数可以用来衡量光采样耦合器的性能。本文对支持三个模式（LP01, LP11a, LP11b）全光 MIMO 信号处理的光采样耦合器开展理论分析，在三个采样点的情况下，对采样光斑的大小和位置进行优化，将矩阵条件数作为优化条件，将 MDL 减少到 0.03d B，IL 减少到 1.9d B。进一步研究发现通过增加采样点的数目可以降低器件的 IL，最后优化后得到 MDL 为 0.04d B，IL 为 1.56d B。尽管通过增加采样点的数目可以降低插入损耗，但由于少模光纤及采样点的几何限制，存在最优的采样点数目。
Optical sampling coupling is a key technology in optical multi-input multi-output (optical MIMO) signal processing. Among them, mode dependent loss (MDL) and insertion loss (IL) are the key factors affecting the performance of the device. The number of matrix conditions can be used to measure the performance of the optical sampling coupler. In this paper, theoretical analysis is made on the optical sampling coupler supporting three modes (LP01, LP11a, LP11b) for all-optical MIMO signal processing. In the case of three sampling points, the size and position of the sampling spot are optimized, the matrix condition number As an optimization, reduce the MDL to 0.03d B and IL to 1.9d B. Further study found that by increasing the number of sampling points can reduce the IL of the device, the final optimization obtained MDL 0.04d B, IL 1.56d B. Although the insertion loss can be reduced by increasing the number of sampling points, there is an optimal number of sampling points due to the geometric limitations of the less mode fiber and the sampling points.