Conference Paper

Effective All-Optical Polarization Control Induced by Raman Nonlinear Amplification

Dept. Electron. & Inf., Politec. di Milano, Milan, Italy
DOI: 10.1109/ECOC.2010.5621415 Conference: Optical Communication (ECOC), 2010 36th European Conference and Exhibition on
Source: IEEE Xplore

ABSTRACT An effective all-optical Raman-based stabilization of any input polarization into a single state is experimentally proved exploiting an optimal combination of pump power, fibre PMD and fibre length, identified through systematic numerical simulations.

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    • "On the other hand, because of their quasiinstantaneous features, nonlinear effects occurring in optical fibers have recently paid considerable attention as a possible solution to all-optical master the polarization of light. Typical and remarkable examples of such a system are the photorefractive crystal-based nonlinear polarizer reported by Heebner et al. in ref. [17] or Raman pulling by Martinelli et al. [18]-[19] as well as Brillouin effect [20]-[23] occurring in optical fibers. These different works have reported convincing experimental proofs of concept but have not yet succeed in a real in-situ Telecommunication demonstration which could stimulate future emerging applications. "
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    ABSTRACT: Controlling the state of polarization of a light beam propagating in a standard single-mode fiber by means of a lossless and instantaneous interaction is a fundamental effect of great interest for telecommunication applications and all-optical signal processing. In this paper, we experimentally demonstrate light-by-light polarization control via a nonlinear interaction occurring in single-mode optical fiber between a signal wave and a counterpropagating control pump beam. We observe a polarization attraction and stabilization of a 10-Gb/s optical telecommunication signal around 1550 nm for either return to zero or nonreturn to zero modulation format. These experimental results confirm yet another fascinating possibility to all-optical control the light properties in optical fiber.
    IEEE Journal of Selected Topics in Quantum Electronics 05/2012; 18(2-18):621 - 628. DOI:10.1109/JSTQE.2011.2119467 · 3.47 Impact Factor
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    • "This cumulative process along the fiber can realize the NLPP. Although co-propagating schemes can achieve high signal repolarization , the synthetized output SOP is not predictable [7], [8]. On the contrary, in a counter-propagating scheme the signal output SOP is determined by the pump input SOP, thus overcoming such unpredictability [2], [9]. "
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    ABSTRACT: Polarization attraction in counterpropagating, randomly birefringent, fiber Raman amplifiers is numerically investigated, including the effects of nonlinear polarization rotation, pump depletion and orthogonal Raman gain. The analysis determines the limitations of the pulling efficiency, and shows that the maximum achievable mean degree of polarization is a function of the mean gain.
    IEEE Photonics Technology Letters 11/2011; DOI:10.1109/LPT.2011.2163061 · 2.18 Impact Factor
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    ABSTRACT: We propose a method for the suppression of relative intensity noise (RIN) at the output of a Raman polarizer, a special type of Raman amplifier that transforms an input weak beam of unpolarized light into an highly polarized amplified beam towards its output. We show that the RIN which is induced by polariza- tion-dependent gain is suppressed whenever the Raman polarizer works in the depleted pump regime.
    IEEE Photonics Technology Letters 08/2011; 23(15):1088-1090. DOI:10.1109/LPT.2011.2157119 · 2.18 Impact Factor

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