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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 1 — Jan. 13, 2014
  • pp: 1028–1035

Phase regeneration of a star-8QAM signal in a phase-sensitive amplifier with conjugated pumps

B. Stiller, G. Onishchukov, B. Schmauss, and G. Leuchs  »View Author Affiliations

Optics Express, Vol. 22, Issue 1, pp. 1028-1035 (2014)

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We demonstrate numerically phase regeneration of a star-8QAM signal with two amplitude and four phase states in a phase-sensitive amplifier. In a dual-stage setup, two phase-conjugated idlers are generated in a first stage consisting of two fiber-optic parametric phase-insensitive amplifiers operated in highly nonlinear gain regime. These are used as pumps in the second, phase-sensitive amplification stage which enables efficient phase regeneration via a degenerate four-wave-mixing process. The latter can be operated in two different operation modes: without format conversion or with phase-shifted amplitude levels. In both regimes, we observe high phase-regeneration efficiency for all amplitude levels: the initial phase noise with 0.2 rad standard deviation is reduced by a factor of 5.

© 2014 Optical Society of America

OCIS Codes
(060.4370) Fiber optics and optical communications : Nonlinear optics, fibers
(070.4340) Fourier optics and signal processing : Nonlinear optical signal processing
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(230.4480) Optical devices : Optical amplifiers

ToC Category:
Nonlinear Optics

Original Manuscript: December 6, 2013
Manuscript Accepted: December 29, 2013
Published: January 9, 2014

B. Stiller, G. Onishchukov, B. Schmauss, and G. Leuchs, "Phase regeneration of a star-8QAM signal in a phase-sensitive amplifier with conjugated pumps," Opt. Express 22, 1028-1035 (2014)

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  9. The simulations are made using VPItransmissionMaker.

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