Optimization of space laser coupling with few-mode fiber in the presence of random angular jitter

In a space laser communication system with few-mode fiber as the receiving terminal, influence of random angular jitter on performance cannot be ignored. Therefore, it is necessary to research coupling characteristics laser–FMF jitter. A model proposed based Laguerre–Gaussian mode. The efficiency and bit error rate (BER) are optimized by relative aperture lens. When 0.15, standard deviation 3, signal-to-noise ratio 5, after optimization improved 29%, BER reduced 46%. this case, maximum reduction 55%. shows that in presence jitter, adjusting can significantly optimize system. ability increases deviation, which exhibits an upper limit for BER.