Multiple-Aperture Direct-Detection Receiver Based on Maximal Ratio Combining for FSO Communication

Collecting light using multiple small apertures offers a lot of advantages over doing so using a single large aperture, including the effective mitigation of scintillation under strong turbulence, low implementation cost, and ease of scalability. In this work, we experimentally demonstrate a free-sp...

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Bibliographic Details
Published in:IEEE photonics technology letters 2022-04, Vol.34 (8), p.405-408
Main Authors: Nguyen, Mat T., Mai, Vuong, Kim, Hoon
Format: Article
Language:English
Subjects:
Adaptive optics
Apertures
Communications systems
Direct detection receivers
Free-space optical communication
Free-space optical communication (FSOC) systems
maximal ratio combining (MRC)
multiple-aperture receiver
Optical fibers
Optical receivers
Optical signal processing
Optical transmitters
Signal to noise ratio
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Summary:Collecting light using multiple small apertures offers a lot of advantages over doing so using a single large aperture, including the effective mitigation of scintillation under strong turbulence, low implementation cost, and ease of scalability. In this work, we experimentally demonstrate a free-space optical communication system utilizing a 7-aperture direct-detection receiver based on the maximal ratio combining (MRC) scheme. For the implementation of MRC scheme blindly by using AC-coupled photo-receivers, we estimate the instantaneous signal-to-noise ratio (SNR) from the received signals time-averaged optimally for bit-error ratio performance. The experiment results show that the proposed blind scheme estimates the SNR accurately, and thus performs similarly to the pilot-symbol-aided scheme.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2022.3164342