摘要
为解决模拟移动前传(A-MFH)中采用强度调制直接检测(IMDD)光链路所面临的额外能源消耗、固有的低链路射频增益和较高的多波长信道串话干扰等问题,提出一种基于马赫-曾德尔干涉仪(MZI)的相位调制直接检测(PMDD)光链路方案,以取代传统IMDD。该方案在光发射机中使用光相位调制(PM)取代强度调制(IM),在光接收机中利用非平衡的MZI获得宽带、高线性的PM到IM信号转换,从而实现光接收机中相位信息的直接检测。大量数值仿真结果表明,当A-MFH中12路100 MHz 64QAM-OFDM信号经过20 km标准单模光纤同步传输时,与IMDD光链路相比,基于MZI的PMDD光链路中光接收机灵敏度获得了4.2 dB的提升。同时,通过适应性功率分配,有效补偿了整个系统的频率响应滚降效应,从而平衡12个信道之间可实现的性能。
To address the additional energy consumption,inherent low radio frequency gain,and higher multi-wavelength channel crosstalk interference faced by intensity modulation and direct detection(IMDD)optical link in analog mobile fronthaul(A-MFH),this paper proposes a phase modulation and direct detection(PMDD)optical link scheme based on the Mach-Zehnder interferometer(MZI)to replace the traditional IMDD.In this scheme,optical phase modulation(PM)instead of intensity modulation(IM)is used in the optical transmitter,and wideband,high-linearity PM-to-IM conversion is achieved in the optical receiver using an unbalanced MZI,which enables the direct detection of phase information in the optical receiver.Extensive numerical simulation results show that when 12 channels of 100-MHz 64QAM-OFDM signals in A-MFH are transmitted synchronously over 20 km of standard single mode fiber,the optical receiver sensitivity in the PMDD optical link based on MZI achieves a 4.2 dB improvement compared to the IMDD optical link.Furthermore,the frequency response roll-off effect of the system is effectively compensated by adaptive power loading to balance the achievable performance among the 12 channels.
作者
李庆洪
青廉
杨冬
谢远举
方志平
何易非
LI Qinghong;QING Lian;YANG Dong;XIE Yuanju;FANG Zhiping;HE Yifei(The 26th Institute of China Electronics Technology Group Corporation,Chongqing 400060,CHN;Chongqing University,Chongqing 400044,CHN)
出处
《半导体光电》
北大核心
2025年第1期98-105,共8页
Semiconductor Optoelectronics
关键词
模拟移动前传
相位调制直接检测
马赫-曾德尔干涉仪
适应性功率分配
analog mobile fronthaul
phase modulation and direct detection
Mach-Zehnder interferometer
adaptive power loading
