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

Yasuhiro Okamura | Zendy; Masashi Abe | Zendy; Kotaro Kondo | Zendy; Yuya Ohmichi | Zendy; Takushi Kazama | Zendy; Takeshi Umeki | Zendy; Masafumi Koga | Zendy; Atsushi Takada | Zendy

Open Access

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

Author(s) -

Yasuhiro Okamura,

Masashi Abe,

Kotaro Kondo,

Yuya Ohmichi,

Takushi Kazama,

Takeshi Umeki,

Masafumi Koga,

Atsushi Takada

Publication year - 2016

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.24.026300

Subject(s) - optics , optical parametric amplifier , materials science , amplifier , phase (matter) , optical amplifier , phase locked loop , second harmonic generation , physics , optoelectronics , phase noise , laser , cmos , quantum mechanics

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.

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