Study of lens performance on fog mitigation in low-cost FSO communication link

Colleen Lau; Kyle Chang; Jeffrey Shieh; Xiaomin Jin

doi:10.1117/12.2583334

5 March 2021 Study of lens performance on fog mitigation in low-cost FSO communication link

Colleen Lau, Kyle Chang, Jeffrey Shieh, Xiaomin Jin

Proceedings Volume 11678, Free-Space Laser Communications XXXIII; 116780V (2021) https://doi.org/10.1117/12.2583334
Event: SPIE LASE, 2021, Online Only

Abstract

Free Space Optics (FSO) has the potential to offer fast broad-bandwidth communication, but experiences signal loss due to atmospheric attenuation. Our study assesses the performance of different lens configurations to mitigate the fog scattering loss in a low-cost visible-band FSO communication system. We built a fog-testing chamber and novel transmitter board to evaluate our FSO link at four different visible-band wavelengths and three different lens configurations. We also analyze the receiver signal strength to determine the fog-induced attenuation and compare each lens performance in the system. To design and evaluate the optimum lens system, several novel transmitterreceiver lens configurations are analyzed and compared: plano-convex to plano-convex (P-P), bi-convex to planoconvex (B-P), and bi-convex to bi-convex (B-B). We observe that the visible-band wavelength can minimizes the amount of fog-induced signal loss. The lens configuration in conjunction with the most optimal visible-band wavelength is then analyzed with various fog levels. We determine the most efficient double-lens configuration in the FSO system with fog-induced noise. On average, the biconvex-planoconvex system performed 63.85% better than the planoconvex-planoconvex system and 50.42% better than the biconvex-biconvex system. These results can be attributed to the spherical aberration from the transmitter lens and will be discussed in the paper.

Conference Presentation

Citation Download Citation

Colleen Lau, Kyle Chang, Jeffrey Shieh, and Xiaomin Jin "Study of lens performance on fog mitigation in low-cost FSO communication link", Proc. SPIE 11678, Free-Space Laser Communications XXXIII, 116780V (5 March 2021); https://doi.org/10.1117/12.2583334

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