带前置光放大器的光接收机灵敏度分析

The Snsitivity Analysis of Receiver with an Optical Preamplifier

本文分析了半导体光放大器的噪声特性，并首次推导出带前置光放大器的接收机灵敏度公式。结果表明，除光放大器内增益外，光放大器入射端耦合效率是影响这种接收机灵敏度的主要因素，而且其最佳判决电平高于原接收机。

The noise characteristics of semiconductor laser amplifier are analyzed. The sensitivity formula of receiver with optical preamplifier is derived for the first time. The results show that the input coupling efficiency of optical preamplifier is the main factor that affects the sensitivity of this sort of receiver besides its imner gain, and the optimum judging lecvel is higher than the original receiver's.