基于密集波分复用的20 Gbit/s大气激光通信

摘要

Due to urgent requirement for high speed transmission, digital atmospheric laser communication system based on double channel dense wavelength division multiplexing (DWDM) is experimentally demonstrated.Optical carriers are provided by two lasers at 1539.76 nm and 1540.55 nm respectively, and intensity modulation is adopted.After being multiplexed and amplified, DWDM signals are transmitted through an optical antenna.Spectrums, waveforms and eye diagrams are measured at receiver after transmission in the atmosphere via 1km.Experimental results show that DWDM signals are de-multiplexed in weak turbulence, and waveforms and eye diagrams are observed clearly.The Q-factors are more than 5 when transmitting 20 Gbit/s modulated signals simultaneously.%针对目前高速率信息传输的迫切需求,设计并实验了两路数字信号密集波分复用(DWDM)的大气激光通信结构.两路激光波长分别为1 539.76 nm和1 540.55 nm,采用强度调制,光信号经复用和放大后,由光学天线发射,经1 km大气信道传输,在接收端对光谱、波形和眼图进行了测量.实验结果显示,在弱湍流情况下,实现了两路光信号的解复用,并得到了较为清晰的波形图和眼图.两路数字信号的传输速率为20 Gbit/s时,Q因子仍达到5以上.