针对高模式群时延(H-MGD)的少模光纤模分复用系统，提出了一种级联独立成分分析(C-ICA)算法，其基本思想是：采用延时补偿与C-ICA结合的技术方案，运用两次ICA算法同时消除模分复用器和解复用器引起的串扰。利用该算法对2×2模分复用系统进行了解复用，并且将其解复用性能与单次ICA算法解复用进行了比较。仿真结果表明，C-ICA算法能够有效实现H-MGD少模光纤模分复用系统的解复用，在同等条件下其解复用效果明显优于单次ICA解复用。

Aiming at the mode division multiplexing system with high-mode group delay (H-MGD) using few-mode fiber, a cascaded independent component analysis (C-ICA) algorithm is proposed. The core idea of the algorithm is that two complex ICA algorithms are combined with a delay compensation module to eliminate the modal crosstalk induced by the mode multiplexer and the demultiplexer respectively. Then the proposed C-ICA algorithm is utilized to demultiplex the received signals from a 2×2 mode division multiplexing system, and the demultiplexing performance of C-ICA is compared with that of the common ICA in which the complex ICA algorithm is used only once. The simulation results indicate that the proposed C-ICA algorithm can implement mode demultiplexing of the mode division multiplexing system with H-MGD few-mode fiber validly. Moreover, C-ICA has better mode demultiplexing performance than the common ICA under the same conditions.