Broadband V-band Radio over Fiber Uplink Fronthaul Transmission Using Cascaded Microwave Photonic Downconversion Topology  

作　　者：Zhang Hui Li Peixuan Zou Xihua Bai Wenlin Pan Wei Yan Lianshan 

机构地区：[1]School of Information Science&Technology,Center for Information Photonics&Communications,Southwest Jiaotong University,Chengdu 610031,Sichuan,China

出　　处：《激光与光电子学进展》2022年第13期435-442,共8页Laser & Optoelectronics Progress

基　　金：国家重点研发计划(2019YFB2203200);国家自然科学基金(62001401);中央高校基本科研业务费专项资金(2682021CX045);四川省科技计划(2022JDTD0013)。

摘　　要：Exploiting microwave photonic(MWP)techniques to generate and distribute high-frequency millimeter-wave(mm-wave)signals,termed mm-wave radio over fiber(m-RoF)signals,holds considerable potential for achieving highdensity and high-capacity fifth-generation and beyond networks.Herein,we experimentally validate a broadband m-RoF uplink fronthaul transmission system using the MWP downconversion concept,which comprises receiving and processing radio-frequency(RF)signals in the unlicensed V-band at around 60 GHz.The proposed system harnesses the simple cascaded modulator topology,in which an ultrawideband off-the-shelf Mach–Zehnder modulator(MZM)renders a simplestructured remote radio head by directly encoding the broadband 60 GHz uplink RF signal into the optical carrier.The nonlinear transfer function of another MZM at the center unit is explored to achieve subharmonic downconversion using cost-effective low-frequency local oscillator signals.Based on proof-of-concept experiments,mm-wave four quadrature amplitude modulation orthogonal frequency-division multiplexing signals centered at frequencies ranging from 51 GHz to 70 GHz are successfully downconverted into signals at the intermediate frequency(IF)of 1.4 GHz.In the case of 1.2 m mm-wave,free-space,and 5 km m-RoF transmissions,the obtained IF signals with a total bandwidth of 2.4 GHz achieve a bit-to-error ratio performance lower than the 7%hard-decision forward error correction limit of 3.8×10^(−3).A gross bit rate of 10 Gbit/s can be achieved over a total spectrum of up to 10 GHz,which fully covers the globally unlicensed V-band of 57-66 GHz.

关 键 词：MILLIMETER-WAVE radio over fiber fifth-generation and beyond networks microwave photonic downconversion 

分 类 号：TN928[电子电信—通信与信息系统]