建立了一种基于模式选择性光子灯笼型模式复用/解复用器的3×3模分复用通信实验系统, 给出了系统的结构框图并阐述了其工作原理。分别利用模式为LP01、LP11a和LP11b的信号传输信道作为独立信道, 采用强度调制和直接探测系统, 实现了3×4.25 Gbit/s伪随机信号在10 km少模光纤中的良好传输。实验测试了接收信号的波形、眼图和误码率。实验结果表明: 当接收功率分别为-19.1 dBm、-15.8 dBm、-16.6 dBm时, 模式为LP01、LP11a和LP11b三路信号的误码率均可达到10-3。

A 3×3 mode division multiplexing communication experimental system is built based on the pattern selectivity of photonic lantern pattern mode multiplexer/demultiplexer. The structural diagram and the operating principle of the system are given. With an intensity modulation and direct detection system, the transmission of 3×4.25 Gbit/s pseudo-random signal in 10 km few-mode fiber is achieved when we use the transmission channels of LP01, LP11a and LP11b modes as the separate channels. The waveforms, eye diagrams and bit error ratio of the received signal are measured. Results show that when the received signal power is -19.1 dBm, -15.8 dBm, -16.6 dBm respectively, the bit error rate of LP01, LP11a and LP11b modes can reach 10-3.