光学学报, 2008, 28 (s2): 188, 网络出版: 2009-01-05
光通信中的功率计算与通信距离等效验证
Power Calculation and Communication Distance Equivalent Demonstration for Optical Communication
光通信 发射功率 最小探测功率 安全系数 通信距离 optical communications transmitting power minimum detecting power security efficiency communication distance
摘要
光通信具有设备体积小、重量轻等优点, 为了保证长距离通信的顺畅进行, 需要对发射功率进行安全系数较高的计算。分析了发射功率、光束发散角和接收灵敏度对系统通信距离与性能的限制。针对光通信中发射功率计算提出了一种安全系数更高的计算公式, 计算公式表明需要求出最小探测功率, 当通信所要求的误码率确定时, 探测器所需最小探测功率可以通过信噪比与接收器所需最小探测功率的关系计算得出, 在实际通信系统中, 探测灵敏度可以测出, 实际通信系统的透过率也可以测出, 探测器所需最小探测功率也可以通过检测得出, 通过实践验证两者结果吻合, 从而验证了发射功率计算公式的可行性。通过计算公式对安全系数最大情况下所能达到的通信距离进行了模拟验证。
Abstract
There are advantages of small volume and light weight in optical communications. For the smooth communication of long distance, the transmitting power should be calculated with higher security efficiency. The constraints of transmitting power, beam divergence and the detecting sensitivity on the communication distance and performance is analyzed. A calculation equation with higher security efficiency is proposed. When the error rate is determined, the minimum detecting power could be calculated by the relationship with signal-to-noise ratio (SNR). In the real communication system, the minimum detecting power could be tested by the relationship with the detecting sensitivity. The calculated equation is verified through the agreement of above two results. The communication distance demonstration is realized by the calculation equation with higher security efficiency.
刘智颖, 胡源, 张磊, 高天元, 王志坚. 光通信中的功率计算与通信距离等效验证[J]. 光学学报, 2008, 28(s2): 188. Liu Zhiying, Hu Yuan, Zhang Lei, Gao Tianyuan, Wang Zhijian. Power Calculation and Communication Distance Equivalent Demonstration for Optical Communication[J]. Acta Optica Sinica, 2008, 28(s2): 188.