设计了一种用于地面至卫星上行通信链路的高速光通信系统，系统采用可编程逻辑门器件（FPGA）作为主控单元，脉冲位置调制（PPM）作为基本调制方式，针对PPM通信中的帧同步问题，设计了特别的帧头帧尾结构保证信息同步。另外接收端对PPM信号同步解调时的时隙同步采用了四个相位时钟同步提取的方法，有效地降低了FPGA的工作频率，简化了系统设计。PPM编码采用格雷码映射，有效地降低了误比特率。系统最终实现了20 Mbit/s的通信速率，实际测试误码率（BER）为8.9×10-9。该系统为后续星地间图像数据信息传输提供了实验支持。

A high speed optical communication system based on field-programmable-gates-array (FPGA) is designed, which can be used in ground to satellite communication. FPGA is used as central process, and pulse position modulation (PPM) is selected. A new frame structure is designed to solve frame synchronizing problem, and four separating phase clocks are used to synchronize PPM slots. FPGA′s working clock is decreased and structure of the system is simplified in the new design, and Gray code is used to decrease bit error. The data rates can reach up to 20 Mbit/s, and bit-error-ratio (BER) is 8.9×10-9. The system provides experimental supports for follow-up image data transforming between ground and satellite.