光纤放大器的放大及噪声特性的量子分析  

Quantum Analysis of Amplification and Noise Characteristics in Fiber Amplifier

作　　者：杨宝[1] 明海[1] 吴云霞[1] 谢建平[1] 

机构地区：[1]中国科学技术大学物理系,合肥230026

出　　处：《量子电子学报》1999年第2期180-185,共6页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金

摘　　要：本文利用热库理论推导出Ｎ个稀土离子和单模场相互作用的约化密度算将的主方程，从而得出光纤放大器的光子放大方程．同时，对集总式光纤放大器的量子噪声也进行了研究，发现理想的光纤放大器可以达到量子噪声极限．若考虑探测器中光电子的离散特性，最小的噪声因子为２；即 ３ ｄＢ．In this paper, the density operator for the single-mode field in interaction with N two-level rare earth ions have been studied by using heat bath method.The photon amplification equation and quantum noise characteristics are obtained. Consequently, the ideal fiber amplifier comes up to quantum limit on noise. In reality, the least noise figure is found to 2, that is 3 dB, due to the shot noise of photondetector.

关 键 词：量子噪声 光纤放大器 噪声因子 热库 

分 类 号：TN722[电子电信—电路与系统]