Optical pump phase locking to a carrier wave extracted from phase-conjugated twin waves for phase-sensitive optical amplifier repeaters

In this paper, an optical phase-locked loop assisted by sum-frequency and second-harmonic generation (SS-OPLL) for frequency nondegenerate optical parametric phase-sensitive amplifier repeaters is experimentally demonstrated. First, theoretical derivations show that carrier extraction from phase-con...

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Bibliographic Details
Published in:Optics express 2016-11, Vol.24 (23), p.26300-26306
Main Authors: Okamura, Yasuhiro, Abe, Masashi, Kondo, Kotaro, Ohmichi, Yuya, Kazama, Takushi, Umeki, Takeshi, Koga, Masafumi, Takada, Atsushi
Format: Article
Language:English
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Summary:In this paper, an optical phase-locked loop assisted by sum-frequency and second-harmonic generation (SS-OPLL) for frequency nondegenerate optical parametric phase-sensitive amplifier repeaters is experimentally demonstrated. First, theoretical derivations show that carrier extraction from phase-conjugated twin waves (PCTWs) and reference light generation are achieved by sum-frequency generation; therefore, the SS-OPLL circuit enables optical phase locking between PCTWs and a pump wave by a simple architecture based on a balanced OPLL. Then, optical phase locking between 20-Gbit/s quadrature phase-shift keying PCTWs and an individual pump source is experimentally demonstrated. Experimental results indicate that phase errors were reduced during the SS-OPLL operation.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.24.026300