Authors:	Y. Yan, J. Van Kerrebrouck, N. Singh, H. Salmanian, M. Yang, Y. Liu, Z. Wu, M. Zhao, G. Morthier
Title:	Optical signal acquisition using an alignment robust receiver based on photodetector array
Format:	International Journal
Publication date:	12/2025
Journal/Conference/Book:	Optics Letters
Volume(Issue):	50(23) p.7199-7202
Location:	Washington, United States
DOI:	10.1364/OL.578046
Citations:	Look up on Google Scholar
Download:	(8.1MB)

Abstract

A high-speed receiver module for free space optical
communications with robust alignment is presented,
incorporating a previously developed photodetector array
(PDA). The PDA was packaged and the frequency
response and transmission performance were characterized.
By optimizing the PCB on which the array is
mounted, a flatter modulation response and higher pixel
bandwidth were achieved. The receiver module exhibited
an average 3-dB bandwidth of 2.5 GHz, with an
alignment tolerance of 37 μm even without mechanical
beam tracking. In a 25-km transmission demonstration,
10 selected pixels operated reliably at 10 Gbps (NRZ).
With additional transmitter-side equalization, NRZ bit
error rates (BER) below 10−12 were achieved at up to 10
Gbps.