用于空间通信的小型化高功率低噪声光纤放大器  

Compact High Power Low Noise Fiber Amplifier for Space Communication

作　　者：陈文韬 徐剑秋 欧阳春梅[1] CHEN Wentao;XU Jianqiu;OUYANG Chunmei(School of Precision Instrument and Optoelectronics Engineering,Tianjin University,Tianjin 300072,China;Suzhou Laser Intelligent Manufacturing Technology Research Institute,Suzhou,Jiangsu 215000,China)

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072 [2]苏州市激光智能制造技术研究所,江苏苏州215000

出　　处：《光子学报》2022年第4期40-48,共9页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.61775159,61735012)。

摘　　要：针对空间应用设计了结构紧凑、高功率、低功耗的光纤放大器。在电学设计上,以数字信号处理芯片为核心处理器设计了泵浦源驱动控制系统,形成了输出-检测-再输出的闭环控制逻辑,通过自动功率控制保证输出稳定性,同时降低泵浦源功耗,提升电光效率。在机械设计上采用光电分离模块化设计,不仅有利于散热和保持紧凑的结构,而且实现光学部分与电学部分互不干扰,并维持整体重量低于1 kg。在光学结构上使用两级放大设计,信号光通过掺铒光纤与铒镱共掺光纤两级放大光路。实验研究了不同泵浦功率、不同光纤长度下放大器的转换效率、功耗以及光谱特性,最终实现了对1551 nm毫瓦级种子光放大至7.39 W的保偏信号输出,信噪比保持在40 dB,整体功耗不超过80 W,适用于空间通信。With the vigorous development of aerospace technology,space communications,especially microwave optical transmission systems,require high-power,high-efficiency lasers and amplifiers to meet the requirements of high speed,large capacity and long transmission distance in space communications.The inter-satellite microwave photonics subsystem transmits the microwave signal to another satellite by modulating the microwave signal to the laser. The signal loss is very large after long-distance transmission.It is necessary to use a fiber amplifier as a preamplifier to improve the signal-to-noise ratio. The conversion efficiency of the fiber amplifier is a key performance index,which is related to the power efficiency,heat dissipation and weight of the entire laser amplifier. Aiming at the space application of optical fiber amplifiers,the design and experimental research of optical fiber amplifiers with compact structure,high output power and low power consumption have been carried out. In the electrical design,a semiconductor laser drive system with a digital signal processing chip as the core processor is designed,and a closed-loop control logic of output-detection-re-output is formed. Through automatic power control,the stability of the output power of the pump laser is ensured,the power consumption of the pump source during idle time is reduced,and the electro-optical efficiency is improved. The drive system is equipped with a temperature sensor and a semiconductor cooler to monitor temperature data in real time,and the semiconductor cooler will maintain the temperature stability of the pump laser. The powers of the input signal light and the output signal light can be obtained by two photodetectors,and the real-time sampling and comparison algorithm realize the automatic standby system when there is no input, and maintain the minimum power consumption operation. The mechanical design adopts photoelectric separation and modular design. Taking into account the temperature-sensitive characteristics of semiconductor lase

关 键 词：空间通信 光纤放大器 数值仿真 自动功率控制 掺铒光纤 铒镱共掺光纤 

分 类 号：TN929.11[电子电信—通信与信息系统]