色散抑制单边带数字滤波多址-无源光网络系统  

Dispersion Suppressed Single Sideband Digital Filtered Multiple Access-Passive Optical Network Systems

作　　者：巩小雪 胡婷[1] 张琦涵 Gong Xiaoxue;Hu Ting;Zhang Qihan(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;School of Computer Science and Engineering,Northeastern University,Shenyang 110819,Liaoning,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]东北大学计算机科学与工程学院,辽宁沈阳110819

出　　处：《光学学报》2022年第14期52-58,共7页Acta Optica Sinica

基　　金：国家自然科学基金项目(62075024,61801105,62025105);重庆市自然科学基金项目(cstc2019jcyj-msxmX0615)。

摘　　要：提出单边带直接检测数字滤波多址无源光网络(DFMA-PON)系统,抑制光纤色散引起的频率选择性衰落现象。同时,为消除直接检测时平方律特性引起的信号与信号间的拍频干扰(SSBI),在接收端设计了适用于DFMA-PON系统的Kramers-Kronig(KK)算法。该算法通过从接收信号的幅度信息中重构出相位信息来恢复原始信号,进而消除SSBI对接收信号的影响,提高接收机灵敏度。仿真结果表明,在不采用其他色散补偿算法的情况下,单边带传输系统较双边带传输系统的性能有显著提升。与接收端不采用KK算法的单边带系统相比,所提方案在经过25 km标准单模光纤传输后,接收机灵敏度最高可提高约5.0 dB。A single sideband direct detection digital filtered multiple access-passive optical network(DFMA-PON) system is proposed to suppress the frequency selective fading effect caused by the fiber dispersion. Moreover, in order to eliminate the signal-signal beat interference(SSBI) caused by the square-law characteristic during the direct detection, a KramersKronig(KK) algorithm suitable for the DFMA-PON system is designed at the receiver. The KK algorithm recovers the original signal by reconstructing the phase information from the amplitude information of the received signal, so as to eliminate the influence of SSBI on the received signal and improve the sensitivity of the receiver. The simulation results demonstrate that the performance of single sideband transmission system is significantly improved compared with that of double sideband transmission system without additional dispersion compensation algorithms. The receiver sensitivity can be increased by about 5. 0 dB at most after 25 km standard single-mode fiber transmission compared with the single sideband system without KK algorithm at the receiver.

关 键 词：光通信 色散 数字滤波多址-无源光网络 单边带 Kramers-Kronig算法 

分 类 号：TN929.1[电子电信—通信与信息系统]