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Published in: Photonic Network Communications 2-3/2022

03-08-2022 | Original Paper

Real time experimental investigation of adaptive optics compensation technique for free space optical communication

Authors: Pasupathi T., Arputha Vijaya Selvi J.

Published in: Photonic Network Communications | Issue 2-3/2022

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Abstract

The variation in refractive index of the atmosphere causes wavefront aberration of optical signal propagating through the random atmosphere. This leads to various effects such as beam spreading, wandering and scintillation (intensity fluctuation) which are responsible for severe signal degrading of the free space optical (FSO) communication system. Incorporation of adaptive optics (AO) technique mitigates the effect of wavefront aberration distortions and reducing the signal fading. Non-conventional adaptive optics is demonstrated using complex search algorithms which requires large number of iterations and computations to obtain the optimum value of the results. In this paper, Convolutional Neural Networks (CNN)-based novel wavefront aberration compensation technique is proposed. The aim of this work is to experience and validate the CNN-based wavefront sensorless adaptive optics (WFSLess AO) technique for 70 m realtime FSOC. The major issues such as time-consuming iterative processes and latency in complex search algorithms and similar algorithms are greatly avoided by detecting the wavefront distortion from the direct images of the optical beam used in the experimentation. LeNet CNN architecture is realized to compensate wavefront distortion for the acquired data sample under different weather condition. Experiments are conducted on Xilinx Spartan-6 FPGA using high level synthesis. The performance of the proposed scheme is compared to existing approaches (T Weyrauch and MA Verontsov in Appl. Opt. 44:6388–6401, 2005; MJ Booth in Opt. Express 14:1339–1352, 2006; H Linhai and R Changhui in Opt. Express 19:371–379, 2011) and it shows an effective Strehl Ratio, Root Mean Square and reduced computation time thereby resolves the latency issue while maintaining accuracy which is a serious problem in AO systems.
Literature
1.
go back to reference Majumdar, A.K.: Advanced Free Space Optics (FSO) A Systems Approach. Springer, USA (2014) Majumdar, A.K.: Advanced Free Space Optics (FSO) A Systems Approach. Springer, USA (2014)
2.
go back to reference Boffi, P., Piccinin, D., Mottarella, D., Mario, M.: All optical free space processing for optical communication signals. Opt. commun. 181(1–3), 79–88 (2007) Boffi, P., Piccinin, D., Mottarella, D., Mario, M.: All optical free space processing for optical communication signals. Opt. commun. 181(1–3), 79–88 (2007)
3.
go back to reference Hu, Q.L., Li, Z.H., Yang, L., Qiao, K., Zhang, X.J.: Overview of research on space laser communication tracking and pointing technology. Chem. Eng. Trans. 46, 1015–1020 (2015) Hu, Q.L., Li, Z.H., Yang, L., Qiao, K., Zhang, X.J.: Overview of research on space laser communication tracking and pointing technology. Chem. Eng. Trans. 46, 1015–1020 (2015)
4.
go back to reference Arockia Bazil Raj, A., Lancelot, J.P.: Seasonal investigation on prediction accuracy of atmospheric turbulence strength with a new model at Punalkulam, Tamil Nadu. J. opt. technol. 83, 55–68 (2016) CrossRef Arockia Bazil Raj, A., Lancelot, J.P.: Seasonal investigation on prediction accuracy of atmospheric turbulence strength with a new model at Punalkulam, Tamil Nadu. J. opt. technol. 83, 55–68 (2016) CrossRef
5.
go back to reference Fuxing, F., Bin, Z.: The influence of high-frequency phase distortion on the phase correction effect in atmosphere. Optik 125, 360–365 (2014) CrossRef Fuxing, F., Bin, Z.: The influence of high-frequency phase distortion on the phase correction effect in atmosphere. Optik 125, 360–365 (2014) CrossRef
6.
go back to reference Shrivastava, S.K., Sengar, S., Singh, S.P.: A new switching scheme for hybrid FSO/RF communication in the presence of strong atmospheric turbulence. Photon. Netw. Commun. 37, 53–62 (2019) CrossRef Shrivastava, S.K., Sengar, S., Singh, S.P.: A new switching scheme for hybrid FSO/RF communication in the presence of strong atmospheric turbulence. Photon. Netw. Commun. 37, 53–62 (2019) CrossRef
7.
go back to reference Vorontsov, M.A., Carhart, G.W., Cohen, M., Cauwenberghs, G.: Adaptive optics based on analog parallel stochastic optimization: analysis and experimental demonstration. J. Opt. Soc. Am. A Opt. Image Sci Vis. 17(8), 1440–1453 (2000) CrossRef Vorontsov, M.A., Carhart, G.W., Cohen, M., Cauwenberghs, G.: Adaptive optics based on analog parallel stochastic optimization: analysis and experimental demonstration. J. Opt. Soc. Am. A Opt. Image Sci Vis. 17(8), 1440–1453 (2000) CrossRef
8.
go back to reference Zommer, S., Ribak, E., Lipson, S., Adler, J.: Simulated annealing in ocular adaptive optics. Opt. Lett. 31, 939–941 (2006) CrossRef Zommer, S., Ribak, E., Lipson, S., Adler, J.: Simulated annealing in ocular adaptive optics. Opt. Lett. 31, 939–941 (2006) CrossRef
9.
go back to reference Yang, P., Ao, M., Liu, Y., Xu, B., Jiang, W.: Intracavity transverse modes controlled by a genetic algorithm based on Zernike mode coefficients. Opt. Express 15(25), 17051–17062 (2007) CrossRef Yang, P., Ao, M., Liu, Y., Xu, B., Jiang, W.: Intracavity transverse modes controlled by a genetic algorithm based on Zernike mode coefficients. Opt. Express 15(25), 17051–17062 (2007) CrossRef
10.
go back to reference Ming, Li., Yupeng, Li., Jiawei, H.: Gerchberg–Saxton algorithm based phase correction in optical wireless communication. Phys. Commun. 25(2), 323–327 (2017) Ming, Li., Yupeng, Li., Jiawei, H.: Gerchberg–Saxton algorithm based phase correction in optical wireless communication. Phys. Commun. 25(2), 323–327 (2017)
11.
go back to reference Antonello, J., Werkhoven, T., Verhaegen, M., Truong, H., Keller, C.U., Gerritsen, H.C.: Optimization-based wavefront sensorless adaptive optics for multiphoton microscopy. J. Opt. Soc. Am. A 31, 1337–1347 (2014) CrossRef Antonello, J., Werkhoven, T., Verhaegen, M., Truong, H., Keller, C.U., Gerritsen, H.C.: Optimization-based wavefront sensorless adaptive optics for multiphoton microscopy. J. Opt. Soc. Am. A 31, 1337–1347 (2014) CrossRef
12.
go back to reference Linhai, H., Rao, C.: Wavefront sensorless adaptive optics: a general model-based approach. Opt. Express 19, 371–379 (2011) CrossRef Linhai, H., Rao, C.: Wavefront sensorless adaptive optics: a general model-based approach. Opt. Express 19, 371–379 (2011) CrossRef
13.
go back to reference Booth, M.J.: Wavefront sensorless adaptive optics for large aberrations. Opt. Lett. 32(1), 5–7 (2007) CrossRef Booth, M.J.: Wavefront sensorless adaptive optics for large aberrations. Opt. Lett. 32(1), 5–7 (2007) CrossRef
14.
go back to reference Song, H., Fraanje, H., Schitter, R., Kroese, H., Vdovin, G., Verhaegen, M.: Model-based aberration correction in a closed-loop wavefront-sensor-less adaptive optics system. Opt. Express 18(23), 24070–24084 (2010) CrossRef Song, H., Fraanje, H., Schitter, R., Kroese, H., Vdovin, G., Verhaegen, M.: Model-based aberration correction in a closed-loop wavefront-sensor-less adaptive optics system. Opt. Express 18(23), 24070–24084 (2010) CrossRef
15.
go back to reference Facomprez, A., Beaurepaire, E., Débarre, D.: Accuracy of correction in modal sensorless adaptive optics. Opt. Express 20(3), 2598–2612 (2012) CrossRef Facomprez, A., Beaurepaire, E., Débarre, D.: Accuracy of correction in modal sensorless adaptive optics. Opt. Express 20(3), 2598–2612 (2012) CrossRef
16.
go back to reference Lohani, S., Glasser, R.T.: Turbulence correction with artificial neural networks. Opt. Lett. 43(11), 2611–2614 (2018) CrossRef Lohani, S., Glasser, R.T.: Turbulence correction with artificial neural networks. Opt. Lett. 43(11), 2611–2614 (2018) CrossRef
17.
go back to reference Li, Z., Zhao, X.: BP artificial neural network based wave front correction for sensor-less free space optics communication. Opt. Commun. 385, 219–228 (2017) CrossRef Li, Z., Zhao, X.: BP artificial neural network based wave front correction for sensor-less free space optics communication. Opt. Commun. 385, 219–228 (2017) CrossRef
18.
go back to reference Zhenxing, X., Ping, Y., Ke, H., Bing, X., Heping, L.: Deep learning control model for adaptive optics systems. Appl. Opt. 58, 1998–2009 (2019) CrossRef Zhenxing, X., Ping, Y., Ke, H., Bing, X., Heping, L.: Deep learning control model for adaptive optics systems. Appl. Opt. 58, 1998–2009 (2019) CrossRef
19.
go back to reference Raj, A.A., Padmavathi, S.: Quality metrics and reliability Analysis of laser communication system. Def. Sci. J. 66, 175–185 (2016) CrossRef Raj, A.A., Padmavathi, S.: Quality metrics and reliability Analysis of laser communication system. Def. Sci. J. 66, 175–185 (2016) CrossRef
20.
go back to reference Weyrauch, T., Verontsov, M.A.: Atmospheric compensation with a speckle beacon in strong scintillation conditions: directed energy and laser communication applications. Appl. Opt. 44(30), 6388–6401 (2005) CrossRef Weyrauch, T., Verontsov, M.A.: Atmospheric compensation with a speckle beacon in strong scintillation conditions: directed energy and laser communication applications. Appl. Opt. 44(30), 6388–6401 (2005) CrossRef
21.
go back to reference Booth, M.J.: Wave front sensor-less adaptive optics: a model based approach using sphere packings. Opt. Express 14(4), 1339–1352 (2006) CrossRef Booth, M.J.: Wave front sensor-less adaptive optics: a model based approach using sphere packings. Opt. Express 14(4), 1339–1352 (2006) CrossRef
22.
go back to reference Linhai, H., Changhui, R.: Wavefront sensor-less adaptive optics: a general model-based approach. Opt. Express 19(1), 371–379 (2011) CrossRef Linhai, H., Changhui, R.: Wavefront sensor-less adaptive optics: a general model-based approach. Opt. Express 19(1), 371–379 (2011) CrossRef
Metadata
Title
Real time experimental investigation of adaptive optics compensation technique for free space optical communication
Authors
Pasupathi T.
Arputha Vijaya Selvi J.
Publication date
03-08-2022
Publisher
Springer US
Published in
Photonic Network Communications / Issue 2-3/2022
Print ISSN: 1387-974X
Electronic ISSN: 1572-8188
DOI
https://doi.org/10.1007/s11107-022-00973-z

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