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无线光纤通信中的信号调制方式多采用单一的脉冲幅度调制技术,传输距离短、信息容量有限、制约系统数据信息传输速率。提出一种基于双重调制技术的光纤通信系统设计,介绍了前端接收模块、变频处理模块、A/D转换模块、FGGA控制模块、USB总线输出模块等系统的硬件构成;在调制识别算法方面提升传统脉冲幅度的调制级别,改善传输速率;引入脉冲宽度调制技术,并对双重调制频谱特征进行了详细分析,在信号断开的状态下,仍然保持较高的数据传输速率,在一定程度上降低了码间干扰程度。实验结果证明提出的系统设计能够有效提高数据传输速率、降低系统误码率、具有良好的适用性。
The signal modulation method in wireless optical fiber communication mostly adopts a single pulse amplitude modulation technique. The transmission distance is short and the information capacity is limited, which restricts the transmission rate of system data information. This paper presents a design of optical fiber communication system based on dual modulation technology. The hardware structure of front-end receiving module, frequency conversion processing module, A / D conversion module, FGGA control module and USB bus output module are introduced. In the aspect of modulation recognition algorithm, Pulse amplitude modulation level to improve the transmission rate; the introduction of pulse width modulation technology, and the dual modulation spectrum characteristics were analyzed in detail, the signal is off the state, still maintain a high data transfer rate, to a certain extent, reduced Inter-code interference. The experimental results show that the proposed system design can effectively improve the data transfer rate, reduce the system error rate, and has good applicability.