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

Álvaro Morales, Idelfonso Tafur Monroy, Fredrik Nordwall, Tommi Sørensen

Research output: Contribution to journalArticleAcademicpeer-review

11 Citations (Scopus)
6 Downloads (Pure)

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 (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.

Original languageEnglish
Article number040603
JournalChinese Optics Letters
Volume16
Issue number4
DOIs
Publication statusPublished - 10 Apr 2018

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