50 GHz optical true time delay beamforming in hybrid optical/mm-wave access networks with multi-core optical fiber distribution  

作　　者：álvaro Morales Idelfonso Tafur Monroy Fredrik Nordwall Tommi Sφrensen 

机构地区：[1]Department of Electrical Engineering, Electro-Optical Communications, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands [2]Tektronix AB, Kista, Sweden [3]GoMeasure ApS, Albertslund, Denmark

出　　处：《Chinese Optics Letters》2018年第4期25-29,共5页中国光学快报（英文版）

基　　金：founded by H2020 ITN CELTA under Grant No.675683 of Call:H2020-MSCA-ITN-2015

摘　　要：We propose and experimentally validate an optical true time delay beamforming scheme with straightforward integration into hybrid optical/millimeter（mm）-wave access networks. In the proposed approach, the most complex functions, including the beamforming network, are implemented in a central office, reducing the complexity and cost of remote antenna units. Different cores in a multi-core fiber are used to distribute the modulated signals to high-speed photodetectors acting as heterodyne mixers. The mm-wave carrier frequency is fixed to 50 GHz（VBand）, thereby imposing a progressive delay between antenna elements of a few picoseconds. That true time delay is achieved with an accuracy lower than 1 ps and low phase noise.We propose and experimentally validate an optical true time delay beamforming scheme with straightforward integration into hybrid optical/millimeter（mm）-wave access networks. In the proposed approach, the most complex functions, including the beamforming network, are implemented in a central office, reducing the complexity and cost of remote antenna units. Different cores in a multi-core fiber are used to distribute the modulated signals to high-speed photodetectors acting as heterodyne mixers. The mm-wave carrier frequency is fixed to 50 GHz（VBand）, thereby imposing a progressive delay between antenna elements of a few picoseconds. That true time delay is achieved with an accuracy lower than 1 ps and low phase noise.

关 键 词：MCF GHz optical true time delay beamforming in hybrid optical/mm-wave access networks with multi-core optical fiber distribution 

分 类 号：TN915.63[电子电信—通信与信息系统]