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Experimental utilization of repeated spatial-mode shifting for achieving discrete delays in a free-space recirculating loop

Ahmed Almaiman, Zhe Zhao, Yinwen Cao, Guodong Xie, Amirhossein Mohajerin-Ariaei, Fatemeh Alishahi, Peicheng Liao, Changjing Bao, Ahmad Fallahpour, Bishara Shamee, Youichi Akasaka, Shlomo Zach, Nadav Cohen, Moshe Tur, and Alan E. Willner

Abstract

We demonstrate an optical recirculating delay loop by shifting the spatial mode order of orbital-angular-momentum (OAM) beams in the free-space. The desired delay can be selected at the loop output by exploiting the orthogonality of the OAM modes. When sending a 20-Gbaud quadrature-phase-shift-keyed (QPSK) signal through the delay system, three recirculations are demonstrated, each with an additional delay of 2.2 ns. Around 0.5 and 2 dB system penalties are measured for the second and third recirculations, respectively. We also simulate the performance of our approach under different scenarios.

© 2018 Optical Society of America

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