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在设计光信号分配网时 ,必须计算出网络中各光分路器的分光比及整条链路需输入的光功率。一般采用逆算法 ,从线路的末端一直到始端进行计算。具体的计算过程如下。(1)确定光接收机输入光功率Ｐｒ,一般取 - 2ｄＢｍ ;考虑 0 .5ｄＢ的活接头损耗及 0 .5ｄＢ的设计裕量 ,确定光纤
When designing the optical signal distribution network, the splitting ratio of each optical splitter in the network and the optical power to be input on the entire link must be calculated. The general use of inverse algorithm, from the end of the line until the beginning of the calculation. The specific calculation process is as follows. (1) determine the optical receiver input optical power Pr, generally take - 2dBm; consider 0 .5dB live connector loss and 0.5dB design margin, determine the optical fiber