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灵敏度是光接收机最重要的指标。本文在推导数字光接收机灵敏度(?)以及APD最佳倍增因子g_(opt)的计算公式时,综合了文献[4]、[6]、[7]等的长处,按“1”、“0”码等概率出现假设分析检测器量子嗓声,以容易确定的光源发送脉冲波形和光纤特性参数作为计算∑_1、Ⅰ_1、Ⅰ_2、Ⅰ_3的出发点,不再采用〈g~2〉=〈g〉~(2+x)这一比较粗糙的近似形式,而改用较精确的〈g~2〉=K〈g〉~3+2(1-K)〈g〉~2-(1-K)〈g〉代入推导过程,导出了各种情况下的计算(?)以及g_(opt)的近似公式,形式简单,便于应用,计算精度较好。
Sensitivity is the most important indicator of an optical receiver. In this paper, the advantages of the literature [4], [6], [7] and so on are summarized in the formulas of the sensitivity of the digital optical receiver (?) And the APD optimum multiplication factor g_ (opt) 0 "yards and other probabilities appear assuming the analysis of the detector’s quantum noise. Using the easy to determine light source to send the pulse waveform and the fiber characteristic parameters as the starting point for calculating Σ_1, I_1, I_2, I_3, > ~ (2 + x), which is a rough approximation, instead of using the more exact g 2 = K 3 g + 2 1-K g 2- ) into the derivation process, the calculation (?) And approximation formula of g_ (opt) under various conditions are derived. The method has the advantages of simple form, easy application and good calculation accuracy.