Experimental utilization of repeated spatial-mode shifting for achieving discrete delays in a free-space recirculating loop.
Opt Lett
; 43(21): 5395-5398, 2018 Nov 01.
Article
en En
| MEDLINE
| ID: mdl-30383016
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.
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01-internacional
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MEDLINE
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En
Revista:
Opt Lett
Año:
2018
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Article