@article{15bd491a556c49c7b24169d73cea327e,
title = "FSO Receiver with High Optical Alignment Robustness Using High-Speed 2D-PDA and Space Diversity Technique",
abstract = "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.",
keywords = "2-D photodetector array, Free space optical communication, space diversity",
author = "Toshimasa Umezawa and Yuki Yoshida and Atsushi Kanno and Atsushi Matsumoto and Kouichi Akahane and Naokatsu Yamamoto and Tetsuya Kawanishi",
note = "Funding Information: Manuscript received April 24, 2020; revised July 10, 2020; accepted July 16, 2020. Date of publication July 23, 2020; date of current version February 16, 2021. This work was supported by JSPS KAKENHI under Grant 18K04156. (Corresponding author: Toshimasa Umezawa.) Toshimasa Umezawa, Yuki Yoshida, Atsushi Kanno, Atsushi Matsumoto, Kouichi Akahane, and Naokatsu Yamamoto are with the Network Science and Convergence Device Technology Laboratory, National Institute of Information and Communications Technology (NICT), Koganei-shi, Tokyo 184-8795, Japan (e-mail: toshi_umezawa@nict.go.jp; yuki@nict.go.jp; kanno@nict.go.jp; a-matsumoto@nict.go.jp; akahane@nict.go.jp; naokatsu@nict.go.jp). Publisher Copyright: {\textcopyright} 1983-2012 IEEE.",
year = "2021",
month = feb,
day = "15",
doi = "10.1109/JLT.2020.3011425",
language = "English",
volume = "39",
pages = "1040--1047",
journal = "Journal of Lightwave Technology",
issn = "0733-8724",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "4",
}