Radio over FSO Communication Using High Optical Alignment Robustness 2D-PDA and its Optical Path Switching Performance

Toshimasa Umezawa*, Pham Tien Dat, Kunihisa Jitsuno, Naokatsu Yamamoto, Tetsuya Kawanishi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We propose a 30 GHz radio over free-space optical (FSO) communication system for indoor wireless communication applications using a newly developed high-speed photodetector array (PDA) device. The new device performs the role of a photodetector with high optical alignment robustness and also acts as a 30 GHz optical-to-radio converter. Small high-speed photodetectors of 30 m size are arranged in a 6 × 6 square-shaped alignment to achieve -4.4 dBm RF output at 30 GHz with an external amplifier. A 3-5 dB in-plane RF power distribution in the 4 × 4 PDA region was evaluated. To confirm the proposed concept, a 1 m long radio transmission over a 1.5 m long FSO transmission setup was demonstrated by switching the optical paths. We successfully confirmed a high data rate of up to 21.1 Gbps using several modulation formats under a static optical path switching condition. Additionally, stable and reproducible error vector magnitudes with a range of approximately 9% were recognized during the 10 switching cycles under a dynamic optical path switching condition.

Original languageEnglish
Article number9484784
Pages (from-to)5270-5277
Number of pages8
JournalJournal of Lightwave Technology
Volume39
Issue number16
DOIs
Publication statusPublished - 2021 Aug 15
Externally publishedYes

Keywords

  • Free space optical communication
  • optical path
  • radio over fiber
  • two-dimensional photodetector array

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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