摘要
传统光通信中的直调直检(IM-DD)系统是最大功率(幅度)受限的系统,中间没有放大器,提高信道容量的问题变成了给定带宽和最大功率(幅度)时的信号空间大小和分布的问题。提出了一种基于IM-DD系统的动态概率整形(DPS)算法,解决了功率受限的问题并提升了系统的信道容量以及误码性能。采用脉冲幅度调制(PAM)格式,仿真结果表明,DPS不仅能带来约0.9 dB的信道容量提升,而且在PAM4和PAM8中分别能带来0.8 dB和1 dB的误码性能提升。
In classic optical communication,intensity modulation direct detection(IM-DD) is a low-power(amplitude) system with no amplifier in the intermediate.Therefore,increasing the channel capacity becomes a challenge of signal space size and distribution at given bandwidth and maximum power(amplitude).The problem of limited power is solved by proposing a dynamic probabilistic shaping(DPS) algorithm based on the IM-DD system,which improves the system’s channel capacity and bit error performance.The pulse amplitude modulation(PAM)format is used in this investigation.DPS can increase channel capacity by approximately 0.9 dB and improve bit error performance by 0.8 dB and 1 dB in PAM4 and PAM8,respectively,according to simulation data.
作者
张黎杰
隋琪
Zhang Lijie;Sui Qi(Institute of Photonics Technology,Jinan University,Guangzhou,Guangdong 511443,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai,Guangdong 511458,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2021年第23期64-70,共7页
Laser & Optoelectronics Progress
基金
广东省重点领域研发计划(2020B0101080002)
国家自然科学基金(61871408)。
关键词
光通信
直调直检
功率受限
信道容量
动态概率整形
optical communications
intensity modulation direct detection
limited power
channel capacity
dynamic probabilistic shaping
