Pulse confinement in optical fibers with random dispersion Misha Chertkov (LANL) Ildar Gabitov (LANL) Jamey Moser (Brown U.)

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Presentation transcript:

Pulse confinement in optical fibers with random dispersion Misha Chertkov (LANL) Ildar Gabitov (LANL) Jamey Moser (Brown U.) Puebla, 12/06

Fiber Electrodynamics, Mono-mode, NLS, Dispersion vs Kerr nonlinearity, Dispersion management Variations of fiber parameters, Noise in NLS, Statistics of pulse propagation: objects, questions Random dispersion, pinning, pulse confinement. Theory and numerics. Polarization Mode Dispersion, Multimode random coupling,etc

Fiber Electrodynamics NLS in the envelope approximation Monomode Weak nonlinearity, slow in z rescaling averaging over amplifiers

Fiber parameters and jargon - peak pulse - Kerr nonlinearity - nonl. retractive index - wavelength - core area - group velocity - char. pulse width - second order dispersion Typical values for Dispersion Shifted Fiber (DSF)

Nonlinear Schrodinger Equation Model A Soliton solution Dispersion balances nonlinearity Integrability (Zakharov & Shabat ‘72) - dispersion length - pulse width - nonlinearity length - pulse amplitude

Dispersion management Model B Lin, Kogelnik, Cohen ‘80 dispersion compensation aims to prevent broadening of the pulse (in linear regime) four wave mixing (nonlinearity) is suppressed effect of additive noise is suppressed Breathing solution - DM soliton no exact solution nearly (but not exactly) Gaussian shape mechanism: balance of disp. and nonl. Turitsyn et al/Optics Comm 163 (1999) 122 Gabitov, Turitsyn ‘96 Smith,Knox,Doran,Blow,Binnion ‘96

Noise in dispersion Questions: Does an initially localized pulse survive propagation? Are probability distribution functions of various pulse parameters getting steady? Answers (analytical & numerical) DSF, Gripp, Mollenauer Opt. Lett. 23, 1603, 1998 Optical-time-domain-reflection method. Measurements from only one end of fiber by phase mismatch at the Stokes frequency Mollenauer, Mamyshev, Neubelt ‘96 Stochastic model (unrestricted noise) Noise is conservative No jitter Abdullaev and co-authors ‘96-’00

Unrestricted noise Nonlinearity is weak (first diagram) Nonlinearity dies (as z increases) == Pulse degradation Question: Is there a constraint that one can impose on the random chromatic dispersion to reduce pulse broadening? Describes slow evolution of the original field

Pinning method Constraint prescription: the accumulated dispersion should be pinned to zero periodically or quasi-periodically The restricted model Periodic quasi-periodic Random uniformly distributed ]-.5,.5[

Restricted (pinned) noise unrestricted restricted The nonlinear kernel does not decay (with z) in the restricted case !!! The averaged equation does have a steady (soliton like) solution in the restricted case DM case

Numerical Computations Fourier split-step scheme Fourier modes Model A Model B

Moral Practical recommendations for improving fiber system performance that is limited by randomness in chromatic dispersion. The limitation originates from the accumulation of the integral dispersion. The distance between naturally occurring nearest zeros grows with fiber length. This growth causes pulse degradation. We have shown that the signal can be stabilized by periodic or quasi-periodic pinning of the accumulated dispersion. Mollenauer, et al. Opt. Lett. 25, 704 (2000) Long haul transmission experiments on fibers constrained from the spans of different types. The periodic compensation of the overall dispersion to the fixed residual value (achieved via insertion of an extra span) optimizes propagation of pulses.

Statistical Physics of Fiber Communications Problems to be addressed: Single pulse dynamics Raman term +noise Polarization Mode Dispersion Additive (Elgin-Gordon-Hauss) noise optimization Joint effect of the additive and multiplicative noises Mutual equilibrium of a pulse and radiation closed in a box (wave turbulence on a top of a pulse) driven by a noise Many-pulse, -channel interaction Statistics of the noise driven by the interaction Suppression of the four-wave mixing (ghost pulses) by the pinning? Multi mode fibers noise induced enhancement of the information flow... Fibrulence == Fiber Turbulence