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光采样耦合技术是全光多输入多输出(MIMO)信号处理中的关键技术。模式相关损耗(MDL)和插入损耗(IL)是影响器件性能的关键因素,矩阵条件数可以用于衡量光采样耦合器的性能。对支持3个线偏振模式(LP_(01),LP_(11a),LP_(11b))全光MIMO信号处理的光采样耦合器进行了理论分析。在3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,并将MDL和IL分别降低至0.03dB和1.90dB。研究发现,通过增加采样点的数目可以降低器件的IL,优化后得到的MDL和IL分别为0.04dB和1.56dB。尽管增加采样点的数目可以降低IL,在少模光纤及采样点的几何限制下,仍存在最优采样点数目。
Optical sampling coupling technology is the key technology in all-optical multiple-input multiple-output (MIMO) signal processing. Mode-dependent loss (MDL) and insertion loss (IL) are key contributors to device performance, and the number of matrix conditions can be used to measure the performance of an optical sample coupler. The theoretical analysis of the optical sampling coupler supporting all-optical MIMO signal processing of three linear polarization modes (LP_ (01), LP_ (11a), LP_ (11b)) is carried out. At three sampling points, the size and position of the sampled spot were optimized, the number of matrix conditions was taken as the optimization condition, and the MDL and IL were reduced to 0.03dB and 1.90dB respectively. The study found that by increasing the number of sampling points can reduce the IL of the device, the optimized MDL and IL were 0.04dB and 1.56dB. Although increasing the number of sampling points can reduce IL, there is still the optimal number of sampling points under the geometrical limitation of the less mode fiber and sampling point.