本文研究了一种变速率OFDM光传输系统的实现模型及其数据的处理流程。该模型的基本原理是系统根据传输数据的速率或者误码率需求,随时变换不同调制格式,实现传输速率的不断改变,并在OFDM数据符号间插入前导符号进行发送端、接收端的星座映射方式同步。通过在Matlab平台上仿真,验证了其处理上的可行性,给出了传输特性的仿真结果并进行了简要分析。 This paper studies a variable rate OFDM optical transmission system to achieve the model and data processing flow. The basic principle of the model is that the system can change the different modulation formats at any time according to the data transmission rate or bit error rate requirement to realize the constant change of the transmission rate and insert the preamble symbols between the OFDM data symbols to carry out the constellation mapping manner synchronization at the receiving end . Through the simulation on the Matlab platform, the feasibility of its processing is verified. The simulation results of transmission characteristics are given and analyzed briefly.