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, Alan E. Willner

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

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.

Original languageEnglish
Pages (from-to)5395-5398
Number of pages4
JournalOptics Letters
Volume43
Issue number21
DOIs
StatePublished - 1 Nov 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018 Optical Society of America.

Funding

Funding. DSCA (4440646262); Vannevar Bush Faculty Fellowship program sponsored by the Basic Research Office of the Assistant Secretary of Defense for Research and Engineering; Office of Naval Research (ONR) (N00014-16-1-2813); National Science Foundation (NSF) (ECCS-1509965).

FundersFunder number
DSCA4440646262
National Science FoundationECCS-1509965
Office of Naval ResearchN00014-16-1-2813
Office of the Assistant Secretary for Research and Technology

    Fingerprint

    Dive into the research topics of 'Experimental utilization of repeated spatial-mode shifting for achieving discrete delays in a free-space recirculating loop'. Together they form a unique fingerprint.

    Cite this