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本文讨论了关于激光直接接收中若干原则性的问题。包括:一、前置放大与探测器的噪声电平之间的匹配;二、探测器件的电流倍增因子的最佳值及其它有关问题;三、前放带宽的最佳选择;四、探测器的负载电阻的确定。在第二个问题中,导出了一个估算雪崩二极管的电流倍增因子最佳值M佳的公式,可供制造与运用雪崩二极管时的参考。
This article discusses several principled questions about direct laser reception. Including: First, the preamplifier and the detector noise level matching; Second, the detection device current multiplication factor of the best value and other related issues; Third, the best choice for the preemptive bandwidth Fourth, the detector The determination of the load resistance. In the second question, a formula for estimating the best current multiplication factor for an avalanche diode is derived for reference when manufacturing and using avalanche diodes.