Dual-wavelength photonic beamformer for OFDM and single-carrier broadband wireless operating over 1-km 7-core fiber fronthaul

Maria Morant, Ailee M. Trinidad, Eduward Tangdiongga, Ton Koonen, Roberto Llorente

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

1 Citation (Scopus)


This paper reports a dual-wavelength photonic beamformer implementing optical true time delay (OTTD) to realize microwave beam steering. The beamformer is capable of providing independent delay tuning to two separate beams modulated on different optical carriers. The integrated TTD chip includes a multiplexer that combines the two input wavelengths, an optical sideband filter (OSBF) and optical ring resonators (ORRs) that induce different optical delays. The ORRs are thermo-optically tuned to change the coupling ratio and obtain an incremental delay in each optical path. The experimental demonstration includes a full-compliant WiFi channel (at 5 GHz or 18 GHz RF bands) transmitted in one optical carrier and a WiMAX channel (at 5.4 GHz or 19 GHz RF) in another optical carrier operating in the resonance slope of the ORRs. The different antenna elements are connected with 1-km of 7-core fiber, achieving EVM-compliant levels at the antennas with beam-steering angles ranging from -40° to +80°. The performance comparison considering single-carrier broadband RF signals at the same frequency bands is also reported in this work.

Original languageEnglish
Title of host publicationBroadband Access Communication Technologies XIV
EditorsBenjamin B. Dingel, Katsutoshi Tsukamoto, Spiros Mikroulis
Number of pages6
ISBN (Electronic)9781510633773
Publication statusPublished - 31 Jan 2020
EventBroadband Access Communication Technologies XIV 2020 - San Francisco, United States
Duration: 4 Feb 20205 Feb 2020

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceBroadband Access Communication Technologies XIV 2020
CountryUnited States
CitySan Francisco


  • beam steering
  • Beamformer
  • multicore fiber
  • OFDM
  • optical ring resonators
  • optical true time delay
  • single carrier signals


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