Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 39, Issue 4, Pages 1040-1047Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.3011425
Keywords
Optical receivers; Optical fibers; High-speed optical techniques; Lenses; Bandwidth; Crosstalk; Free space optical communication; space diversity; 2-D photodetector array
Funding
- JSPS KAKENHI [18K04156]
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This study introduces a free-space optical (FSO) receiver with high optical alignment robustness using a single optical lens and a newly developed 2-D photodetector array (2D-PDA). The 6 x 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 found to be as large as 12 mm, and the multiple-output signals from the 2D-PDA are utilized for the maximum ratio combining method in space diversity.
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 x 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.
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