大带宽光信号探测技术研究进展(特邀)  

Progress of Large-Bandwidth Optical Signal Measurement Technology(Invited)

作　　者：李仑 刘赛阳 龚绎天 张驰 张新亮 Li Lun;Liu Saiyang;Gong Yitian;Zhang Chi;Zhang Xinliang(Wuhan National Laboratory for Optoelectronics,School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China;ptics Valley Laboratory,Wuhan 430074,Hubei,China)

机构地区：[1]华中科技大学武汉光电国家研究中心,光学与电子信息学院,湖北武汉430074 [2]湖北光谷实验室,湖北武汉430074

出　　处：《光学学报》2024年第13期1-17,共17页Acta Optica Sinica

基　　金：国家重点研发计划(2022YFF0705904);国家自然科学基金(62075072,61927817)。

摘　　要：传统时域探测技术对光电探测器和模数转换器的带宽要求较高,面临着测量分辨率及测量信息完整度的挑战。基于傅里叶域的测量方案被陆续提出,通过全光频率-时间转换技术将受限的频率带宽转换到不受限的时间维度,突破大带宽光信号实时测量的带宽限制。回顾了大带宽光信号探测技术的研究进展,分析了各方案的原理及应用场景,并对目前存在的应用限制提出了解决思路与技术方案。Significance In recent years,with the development of broadband network applications such as real-time video calls and virtualized data centers,network traffic capacity has increased exponentially.Cloud service providers and hyperscale data center operators are gradually moving from 400 Gigabit Ethernet to 800 Gigabit Ethernet to meet the growing network capacity needs.Meanwhile,with the development of ultrafast laser technology,the pulse width has reached femtosecond or even attosecond levels.The trend of optical communications and the ultra-short optical pulses indicate that the optical signal bandwidth has exceeded 1 THz.The widespread applications of advanced modulation formats and multi-dimensional multiplexing technology in optical communications have analyzed high-speed signals more complex,putting forward higher requirements for measurement technology's bandwidth,speed,and detection information dimension.Currently,the available largest bandwidth real-time oscilloscope is developed by Keysight(UXR1104A),with an analog bandwidth of 110 GHz.Due to the electronic bottleneck limitations,making more significant progress in the bandwidth of time-domain detection technology is challenging.Meanwhile,the applications under advanced modulation format measurement scenarios are hard to realize due to square rate detection and lack of signal phase information.Progress The bandwidth of direct time-domain measurement methods is limited by electrical bottlenecks.To expand the measurement bandwidth,we propose a multi-channel coherent synthesis solution to achieve an equivalent real-time bandwidth of 160 GHz,but the system is complex and expensive.Additionally,asynchronous sampling solutions can significantly increase measurement bandwidth but are only suitable for repetitive periodic signals,such as commercial communication signal analyzers or eye diagram analyzers,which are usually employed for optical performance monitoring.Meanwhile,the sampling scheme cannot achieve synchronous WDM signal observation.Methods based on th

关 键 词：光通信 大带宽光信号探测 高速光通信 傅里叶域测量 

分 类 号：O438[机械工程—光学工程]