基于不同泵浦方案的全光纤少模放大器放大特性对比研究  

Experimental Comparative Study on Gain and Noise Characteristics of All-Fiber Few-Mode Amplifier Under Different Pumping Methods

作　　者：张心怡 方翼鸿 黄锡恒 曾研 秦玉文 许鸥[2,3] 李建平 ZHANG Xin-yi;FANG Yi-hong;HUANG Xi-heng;ZENG Yan;QIN Yu-wen;XU Ou;LI Jiang-ping(School of Physics and Optoelectronic Engineering,Guangdong University of Technology,Guangzhou,Guangdong 510006,China;School of Information Engineering,Guangdong University of Technology,Guangzhou,Guangdong 510006,China;Institute of Advanced Photonics Technology,Guangzhou,Guangdong 510006,China)

机构地区：[1]广东工业大学物理与光电工程学院,广东广州510006 [2]广东工业大学信息工程学院,广东广州510006 [3]先进光子技术研究院,广东广州510006

出　　处：《电子学报》2024年第6期2074-2082,共9页Acta Electronica Sinica

基　　金：国家重点研发计划(No.2018YFB1800900)。

摘　　要：设计并构建全光纤型少模掺铒放大器,实验对比研究不同泵浦模式及方向对LP01、LP11a、LP11b这3个信号模式的增益特性影响.实验对泵浦功率、输入信号功率以及多波长情况下的放大器特性进行分析.结果表明,4种泵浦方案中,前向LP11泵浦情况下放大器有最佳性能,在整个C波段上信号增益超过20 dB、模式增益差低于0.9 dB,噪声系数小于9.6 dB;信号输入功率为-10 dBm/模式时,在1550 nm处,3个信号模式的增益均超过20.8 dB、DMG低至0.3 dB、LP01信号光的噪声系数低于6.2 dB以及LP11信号光的噪声系数低于9.6 dB.4种泵浦方案下对比不同泵浦方向可得:前向泵浦放大器的噪声系数最小,但3种信号模式的增益也较小,而采用后向泵浦时,高阶信号模式增益增加,但噪声系数也会变大.对比泵浦模式可发现,相比于LP01泵浦,LP11泵浦能大幅提高LP11信号光的增益,对LP01信号光增益影响较小,从而可降低DMG值.An all-fiber few-mode erbium-doped amplifier was built to compare the effects of different pump modes and different pump directions on the gain characteristics of the three signal modes,LP01,LP11a,and LP11b.The experimental results show that the amplifier has the best performance under forward LP11 pumping.The signal gain is more than 20 dB,the differential modal gain(DMG)is less than 0.9 dB and the noise figure is less than 9.6 dB in the whole C band.At a signal input power of-10 dBm/mode,the gain of all three signal modes at 1550 nm exceeds 20.8 dB,the DMG is as low as 0.3 dB,the noise figure of LP01 signaling light is lower than 6.2 dB,and the noise figure of LP11 signaling light is lower than 9.6 dB.Comparing the different pumping directions under the four pumping schemes,it can be found that the noise figure of the forward-pumped amplifier is the smallest,but the gains of the three signal modes are also smaller,while the gain of the higherorder signal modes is increased by using the backward-pumped one,but the noise figure will also become larger.Comparing the pumping modes,it can be found that compared with the LP01 pumping,the LP11 pumping can significantly increase the gain of the LP11 signaling light,and has less effect on the gain of the LP01 signaling light,which can reduce the DMG value.

关 键 词：模分复用 掺铒光纤 全光纤放大器 增益均衡 噪声系数 

分 类 号：TN929.11[电子电信—通信与信息系统] TN722[电子电信—信息与通信工程]