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  • Received: Jan. 11, 2018

    Accepted: Feb. 7, 2018

    Posted: Jan. 17, 2019

    Published Online: Jul. 12, 2018

    The Author Email: Álvaro Morales (a.morales.vicente@tue.nl)

    DOI: 10.3788/COL201816.040603

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    Álvaro Morales, Idelfonso Tafur Monroy, Fredrik Nordwall, Tommi Sørensen. 50 GHz optical true time delay beamforming in hybrid optical/mm-wave access networks with multi-core optical fiber distribution[J]. Chinese Optics Letters, 2018, 16(4): 040603

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Chinese Optics Letters, Vol. 16, Issue 4, 040603 (2018)

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

Álvaro Morales1,*, Idelfonso Tafur Monroy1, Fredrik Nordwall2, and Tommi Sørensen3

Author Affiliations

  • 1Department of Electrical Engineering, Electro-Optical Communications, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
  • 2Tektronix AB, Kista, Sweden
  • 3GoMeasure ApS, Albertslund, Denmark

Abstract

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 (V-Band), 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.

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