FSO Receiver With High Optical Alignment Robustness Using High-Speed 2D-PDA and Space Diversity Technique

A free-space optical (FSO) receiver with high optical alignment robustness configured by a single optical lens is presented, in addition to a newly developed 2-D photodetector array (2D-PDA). A 6 × 6 square-shaped aligned arrangement matrix structure in the 2D-PDA provides a large active area for ph...

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Bibliographic Details
Published in:Journal of lightwave technology 2021-02, Vol.39 (4), p.1040-1047
Main Authors: Umezawa, Toshimasa, Yoshida, Yuki, Kanno, Atsushi, Matsumoto, Atsushi, Akahane, Kouichi, Yamamoto, Naokatsu, Kawanishi, Tetsuya
Format: Article
Language:English
Subjects:
2-D photodetector array
Alignment
Bandwidth
Bit error rate
Crosstalk
Free space optical communication
High-speed optical techniques
Lenses
Microscopes
Optical fibers
Optical receivers
Robustness
space diversity
Systems design
Tracking systems
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Summary:A free-space optical (FSO) receiver with high optical alignment robustness configured by a single optical lens is presented, in addition to a newly developed 2-D photodetector array (2D-PDA). A 6 × 6 square-shaped aligned arrangement matrix structure in the 2D-PDA provides a large active area for photodetection. In a 1.5-m FSO demonstration, the optical alignment tolerance on the receiver's lens is evaluated to be as large as 12 mm. The multiple-output signals from the 2D-PDA are used for the maximum ratio combining method in space diversity. The system design and alignment tolerance without a mechanical beam-tracking system are presented and the bit error rate contributed by space diversity is discussed.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2020.3011425