光纤水听器远程全光放大系统相位噪声研究  

Phase Noise Characteristics of Remote Amplification for Fiber-Optic Hydrophone System

作　　者：曹春燕[1,2] 胡宁涛 熊水东 夏霁[1,2] 侯庆凯 Cao Chunyan;Hu Ningtao;Xiong Shuidong;Xia Ji;Hou Qingkai(College of Meteorology and Oceanology,National University of Defense Technology,Changsha 410073,Hunan,China;Hunan Key Laboratory of Ocean Exploration Technology,Changsha 410073,Hunan,China)

机构地区：[1]国防科技大学气象海洋学院,湖南长沙410073 [2]海洋探测技术湖南省重点实验室,湖南长沙410073

出　　处：《光学学报》2023年第11期9-16,共8页Acta Optica Sinica

基　　金：国家自然科学基金(61905283,61605244)。

摘　　要：光功率冗余不足及相位噪声增加是制约光纤水听器传输距离及探测性能的关键因素。基于光纤水听器全光模拟传输系统,建立远程放大相位噪声模型,设计大有效面积低损耗光纤组合传输链路,在100 km传输4波分×8时分复用系统中,远程放大引入的相位噪声仅为-98.1 dB@1 kHz(1 kHz为频率),优于常规单模光纤4.3 dB,模型的有效性得到了验证。将模型应用于150 km传输系统,对远程增益单元位置进行优化,获得了-93.2 dB@1 kHz的远程放大噪声性能。所提噪声模型及优化方法可应用于不带电中继的光纤水听器系统设计及研制中,对增大全光传输距离及提升远程探测性能具有重要意义。Objective Bottommounted and alloptical transmitted interferometric fiberoptic hydrophone array systems have the advantages of underwater uncharged and high reliability and are widely used in subsea oil exploration,marine acoustic exploration,and other fields.However,with an increase in the remote transmission distance,the phase noise of the system increases sharply due to the nonlinear effect of the fiber and high optical losses,which limit the detection performance.In optical communication,the schemes of remote pumped optical amplification(ROPA)and fiber Raman amplification(FRA),combined with large effective area and lowloss optical fibers,are used in longdistance unrepeated transmission systems,and good noise index and low bit error rate have been achieved.However,because opticalfiber hydrophone systems are based on a coherent detection scheme with high sensitivity,phase noise is a critical factor for the performance evaluation.Thus,the actual performance cannot be determined by only the noise index.However,only a few analyses and experimental studies on the phase noise characteristics of fiber hydrophone systems with remote pumped amplification and newtype fiber transmission structures have been reported.In this study,we developed a phase noise model based on a remote alloptical transmission and amplification structure for opticalfiber hydrophone systems with a hybrid timedivision multiplexing(TDM)and wavelengthdivision multiplexing(WDM)array scheme.System parameters,such as the transmission link and remote gain position,were optimized through the model,which effectively reduced the system noise.The proposed noise model and optimization method can be applied to unrepeated fiberoptic hydrophone systems as they greatly improve the alloptical transmission distance and remote detection performance.Methods Based on the structure of a remotetransmitted and amplified hydrophone system with a dedicated pump path scheme(Fig.1),we developed a phase noise model of the remote amplification.First,the cascaded noise index o

关 键 词：光纤水听器 远程泵浦光放大 相位噪声 大有效面积低损耗光纤 

分 类 号：TN253[电子电信—物理电子学]