A Novel Bi-wavelength Method for Accurately Measuring Gain and Noise Characteristics of an Erbium-Doped Fibre Amplifier for Multi-Channel Wavelength Division Multiplexing Transmission

作     者：刘艳格 蒙红云 袁树忠 田建国 开桂云 董孝义 

作者机构：InstituteofPhysicsNankaiUniversityTianjin300071 InstituteofModernOpticsNankaiUniversityTianjin300071 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2003年第20卷第10期

页      面：1777-1780页

核心收录：

学科分类：080902[工学-电路与系统] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0803[工学-光学工程] 

基　　金：天津市自然科学基金 

主　　题：Channel numbers noise characteristics Transmission systems maximum error ENTERING Gain Wavelength division multiplexing wavelengths 

摘      要：Gain and noise figure (NF) are the most important two parameters of an erbium-doped fibre amplifier (EDFA) for a multi-channel wavelength division multiplexing (WDM) transmission system. A simple bi-wavelength method for accurate gain and NF spectrum measurement of EDFA for WDM applications is proposed. A saturating input signal, whose power equals to the sum of all the WDM signal power and whose wavelength is determined by the channel numbers, and the wavelength of the WDM input signals saturates the EDFA in a degree as the same as the WDM signals input. Meanwhile, a small power probe signal scans and measures the gain and the NF value at every wavelength of the WDM input signals. Investigative results by numerical simulation show that the gain and the NF spectra measured by this method have good agreement with the real spectra of the WDM signal input in a large total input power range. The maximum errors of the gain and the NF are less than 0.2 dB and 0.16 dB, respectively, for a 50-channel input case. The method is competent for the accurate gain and the NF spectrum measurement of the fibre preamplifier and the line-amplifier for WDM applications and has the advantages of simplicity, convenience and easy implement.