Interdisciplinary Seminar in Nonlinear Science

Title: Phase jitter in soliton communication systems
Speaker: C. McKinstrie
Speaker Info: Bell Laboratories, Lucent Technologies
Brief Description:
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In differential-phase-shift-keyed (DPSK)communication systems information is encoded using the phase differences between neighboring solitons. For DPSK systems the error-free transmission distance is limited by phase jitter, in which power shifts caused by amplifier noseare converted into phase shifts by self-phase modulation. I will describe how to model the growth of phase jitter in constant-dispersion and dispersion-managed systems. I will also describe how cross-phase modulation augments the growth of phase jitter in wavelength-division- multiplexed systems. Phase jitter in any system can be reduced significantly by in-line phase conjugation and post-transmission nonlinear phase-shift compensation. Phase jitter is governed by a pair of stochastic differential equations (SDEs) for the soliton power and phase perturbations. If the perturbations are small, one can model their growth using linearized SDEs, which produce Gauss probability-density functions (PDFs). However, system failures are caused by large perturbations that occur infrequently. For such perturbations the lin- earized equations (and the associated Gauss PDFs)are not valid. I will describe how to model power and phase jitter analytically, by using methods of statistical physics, and numerically, by making importance- sampled simulations based on the SDEs.
Date: Friday, January 23, 2004
Time: 2:00PM
Where: Tech M416
Contact Person: Bill Kath
Contact email: kath@northwestern.edu
Contact Phone: 847-491-8784
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