25-Gbaud 4-WDM free-space optical communication using high-speed 2-d photodetector array

Toshimasa Umezawa*, Takahide Sakamoto, Atsushi Kanno, Atsushi Matsumoto, Kouichi Akahane, Naokatsu Yamamoto, Tetsuya Kawanishi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


We present a newly developed two-dimensional photodetector array (2D-PDA) device and its application for short-range free-space optical (FSO) communication using a wavelength-division multiplexed beam. The 2D-PDA enables direct optical coupling to the FSO beam, simplifying the optical alignment process needed for 10-μm single-mode fiber coupling and reducing the need for beam-tracking function. In the wavelength-division multiplexing (WDM) FSO communication demonstration, a four-wavelength 25-Gbaud parallel beam filtered by a 4-WDM filter through free space was successfully received by 4-pixels in the 2D-PDA. This paper discusses the design and fabrication in the 2D-PDA device, as well as the FSO communication demonstration using four combined WDM filters.

Original languageEnglish
Article number8540002
Pages (from-to)612-618
Number of pages7
JournalJournal of Lightwave Technology
Issue number2
Publication statusPublished - 2019 Jan 15


  • Free space optical communication
  • high speed
  • two-dimensional photodetector array
  • wavelength division multiplexing

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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