Abstract

We present a newly developed resonant cavity 4-λ integrated two-dimensional 4 × 4 photodetector array (2D-PDA) device and its application for a wavelength-division-multiplexing (WDM) free-space optical (FSO) communication. 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 WDM-FSO communication demonstration, a four-wavelength beam in free space was successfully received by 4-different cavity length PD pixels in 4 × 4 PDA with crosstalk between each channel. This paper discusses about the fabrication and characteristic of the 2D-PDA device, in addition to the 25 Gbps/λ FSO communication demonstration using the 4 × 4 2D-PDA. Considering the crosstalk, the bit error rate is discussed in the 2-WDM and 3-WDM FSO communication demonstrations at 25 Gbps/λ.

WDM FSO Network With Turbulence-Accentuated Interchannel Crosstalk

Abisayo O. Aladeloba, Malcolm S. Woolfson, and Andrew J. Phillips
J. Opt. Commun. Netw. 5(6) 641-651 (2013)

800 Gb/s/200 m FSO link with a WDM-PAM4 scheme and SLM-based beam tracking technology

Hai-Han Lu, Xu-Hong Huang, Wen-Shing Tsai, Chao-Yu Feng, Cing-Ru Chou, Yi-Hao Chen, Yu-Ting Huang, and Agustina Nainggolan
Opt. Lett. 46(6) 1269-1272 (2021)

150  m/280  Gbps WDM/SDM FSO link based on OEO-based BLS and afocal telescopes

Hai-Han Lu, Chun-Yu Lin, Ting-Chien Lu, Chien-An Chu, Hung-Hsien Lin, Bo-Rui Chen, Chang-Jen Wu, and Wen-Shing Tsai
Opt. Lett. 41(12) 2835-2838 (2016)

Adaptive optical beam alignment and link protection switching for 5G-over-FSO

Marco A. Fernandes, Bruno T. Brandão, Petia Georgieva, Paulo P. Monteiro, and Fernando P. Guiomar
Opt. Express 29(13) 20136-20149 (2021)

Turbulence-resilient pilot-assisted self-coherent free-space optical communications using a photodetector array for bandwidth enhancement

Hao Song, Runzhou Zhang, Huibin Zhou, Xinzhou Su, Kaiheng Zou, Yuxiang Duan, Narek Karapetyan, Haoqian Song, Kai Pang, Nanzhe Hu, Amir Minoofar, Moshe Tur, and Alan E. Willner
Opt. Lett. 47(21) 5723-5726 (2022)