Air turbulence effects on performance of optical wireless communication with crosstalk in server backplane
Free space optical interconnections (FSOIs) are anticipated to become a prevalent technology for short-range high-speed communication. FSOIs use lasers in board-to-board and rack-to-rack communication to achieve improved performance in next generation servers and are expected to help meet the growing demand for massive amounts of inter-card data communication. An array of transmitters and receivers arranged to create an optical bus for inter-card and card-to-backplane communication could be the solution. However, both chip heating and cooling fans produce temperature gradients and hot air flow that results in air turbulence inside the server, which induces signal fading and, hence, influences the communication performance. In addition, the proximity between neighboring transmitters and receivers in the array leads to crosstalk in the received signal, which further contributes to signal degradation. In this Letter, the primary objective is to experimentally examine the off-axis crosstalk between links in the presence of turbulence inside a server chassis. The effects of geometrical and inter-chassis turbulence characteristics are investigated and first-and second-order statistics are derived.
D. Bykhovsky：Electro-optical Engineering Unit, Ben-Gurion University of the Negev, Beer-Sheva, IsraelElectrical and Electronics Engineering Department, Shamoon College of Engineering, Beer-Sheva, Israel
and S. Arnon：Electrical and Computer Engineering Department, Ben-Gurion University of the Negev, Beer-Sheva, Israel
【1】A. F. Benner, M. Ignatowski, J. A. Kash, D. M. Kuchta, and M. B. Ritter, IBM J. Res. Dev. 49, 755 (2005).
【2】R. Rachmani, A. Zilberman, and S. Arnon, J. Lightwave Technol. 30, 156 (2012).
【3】R. Rachmani, and S. Arnon, J. Lightwave Technol. 30, 1359 (2012).
【4】D. Bykhovsky, D. Elmakayes, and S. Arnon, J. Lightwave Technol. 33, 2777 (2015).
【5】C. DeCusatis, J. Lightwave Technol. 32, 544 (2014).
【6】N. Bamiedakis, A. Hashim, R. V. Penty, and I. H. White, J. Lightwave Technol. 32, 1526 (2014).
【7】I.-K. Cho, K. B. Yoon, S. H. Ahn, M. Y. Jeong, H.-K. Sung, B. H. Lee, Y. U. Heo, and H.-H. Park, IEEE Photon. Technol. Lett. 16, 1754 (2004).
【8】R. Dangel, C. Berger, R. Beyeler, L. Dellmann, M. Gmur, R. Hamelin, F. Horst, T. Lamprecht, T. Morf, S. Oggioni, M. Spreafico, and B. J. Offrein, IEEE Trans. Adv. Packag. 31, 759 (2008).
【9】H. Ma, A.-Y. Jen, and L. Dalton, Adv. Mater. 14, 1339 (2002).
【10】K. Wang, A. Nirmalathas, C. Lim, E. Skafidas, and K. Alameh, J. Lightwave Technol. 31, 1687 (2013).
【11】W. Popoola, Z. Ghassemlooy, C. Lee, and A. Boucouvalas, Opt. Laser Technol. 42, 682 (2010).
【12】L. C. Andrews, Opt. Eng. 46, 086002 (2007).
【13】H. Kaushal, V. Kumar, A. Dutta, H. Aennam, V. K. Jain, S. Kar, and J. Joseph, IEEE Photon. Technol. Lett. 23, 1691 (2011).
【14】H. Kaushal, and G. Kaddoum, “Free space optical communication: challenges and mitigation techniques,” arXiv:1506.04836 (2015).
【15】S. Navidpour, M. Uysal, and M. Kavehrad, IEEE Trans. Wireless Commun. 6, 2813 (2007).
【16】Z. Ghassemlooy, W. Popoola, and S. Rajbhandari, Optical Wireless Communications: System and Channel Modelling with Matlab (CRC Press, 2012).
【17】D. Bykhovsky, Appl. Opt. 54, 9055 (2015).
【18】D. Bykhovsky, J. Lightwave Technol. 34, 2106 (2016).
【19】L. C. Andrews, and R. L. Phillips, Laser Beam Propagation Through Random Media , 2nd ed. (SPIE, 2005).
D. Elmakias, D. Bykhovsky, and S. Arnon, "Air turbulence effects on performance of optical wireless communication with crosstalk in server backplane," Chinese Optics Letters 15(2), 020602 (2017)
【2】Abdelbaset S. Hamza, Jitender S. Deogun, Dennis R. Alexander. Classification Framework for Free Space Optical Communication Links and Systems. IEEE Communications Surveys & Tutorials, 2019, 21(2): 1346