超宽带、高增益、低噪声L-band扩展掺铒光纤及其放大性能研究  

Ultra-Broadband,High Gain,and Low Noise Extended L-Band Erbium-Doped Fiber and Its Amplification Performance

作　　者：褚应波 娄阳 陈阳 辜之木 邱强 刘长波 戴能利 李进延 Chu Yingbo;Lou Yang;Chen Yang;Gu Zhimu;Qiu Qiang;Liu Changbo;Dai Nengli;Li Jinyan(Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan,Hubei 4:30074,China;Wuhan Changjin Laser Technology Co.,Ltd.,Wuhan,Hubei 430074,China)

机构地区：[1]华中科技大学武汉光电国家研究中心,湖北武汉430074 [2]武汉长进激光技术有限公司,湖北武汉430074

出　　处：《中国激光》2021年第7期214-218,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金青年项目(61805093)。

摘　　要：报道了一种采用改进化学气相沉积(Modified Chemical Vapor Deposition,MCVD)技术制备的L-band扩展掺铒光纤。实验测试了该掺铒光纤的基本光学参数及其宽带放大性能,其数值孔径为0.2,在980 nm处的吸收系数为11.04 dB/m,在1535 nm处的吸收系数为38.8 dB/m,在1200 nm处的背景损耗为15 dB/km。采用两级放大结构测试该掺铒光纤的L-band放大性能,其中第一级铒纤长度为11 m,第二级铒纤长度为25 m。当输入信号范围为1570~1622 nm,输入信号的功率为-1 dBm时,在980 nm半导体激光器泵浦下20 dB增益带宽长波段可扩展到1622 nm,最大噪声指数为5.3 dB,饱和输出功率为24.5 dBm。Objective With the rapid development of 5G communications,global cloud computing,ultrahigh-definition videos,and internet of things,the demand for data communications has increased exponentially.Moreover,the traditional communication systems are unable to meet the current data transmission requirements.The communication capacity of a single channel is close to Shannon's limit and is challenging to increase.Therefore,expanding the transmission bandwidth,particularly for the L-band,is currently an effective solution based on the existing transmission systems.Methods A modified chemical vapor deposition(MCVD)technology was used to fabricate the extended L-band erbium-doped fibers.To extend the L-band gain bandwidth,P/Al was introduced into the fiber core to suppress the excited state absorption(ESA)of Er^(3+).In addition,the optical parameters of the fibers were measured and analyzed,and the L-band amplification performance was investigated based on the two-stage amplification structure.Results and Discussions The erbium-doped fiber has the core and cladding diameters of 5.4μm and 125μm,respectively.The fiber's numerical aperture is approximately 0.2,the absorption coefficients at 980 nm and 1535 nm are 11.04 dB/m and 38.8 dB/m,respectively,and the background loss at 1200 nm is 15 dB/km.Figure 2 shows the absorption and emission cross-sections of the extended L-band erbium-doped fiber.The difference between emission and absorption in the L-band region reflects the gain capability of the fiber in the L-band.Ostensibly,when the wavelength is longer than 1622 nm,the difference between emission and absorption is negligible,indicating that the ESA of the erbium-doped fiber is well suppressed and it has a strong gain ability in the extended L-band region.Based on the two-stage amplification structure in Fig.3,the input signal power is-1 dBm,the 20 dB gain output is extended to 1622 nm,the maximum noise figure is 5.3 dB,and the saturated output power is 24.5 dBm.Conclusions We demonstrated an extended L-band erbium-doped

关 键 词：光纤光学 掺铒光纤 L-band扩展掺铒光纤 宽带放大 MCVD 

分 类 号：TN913.7[电子电信—通信与信息系统]