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 language | English |
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Pages (from-to) | 5395-5398 |
Number of pages | 4 |
Journal | Optics Letters |
Volume | 43 |
Issue number | 21 |
DOIs | |
State | Published - 1 Nov 2018 |
Externally published | Yes |
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).
Funders | Funder number |
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DSCA | 4440646262 |
National Science Foundation | ECCS-1509965 |
Office of Naval Research | N00014-16-1-2813 |
Office of the Assistant Secretary for Research and Technology |