Quantum noise in optical fibers II: Raman jitter in soliton communications

Details Quantum noise in optical fibers II: Raman jitter in soliton communications Quantum noise in optical fibers II: Raman jitter in soliton communications

1999-12-21

arxiv.org/abs/quant-ph/9912096v2

Physics

Quantum Physics

3 figures

Scientific paper

The dynamics of a soliton propagating in a single-mode optical fiber with gain, loss, and Raman coupling to thermal phonons is analyzed. Using both soliton perturbation theory and exact numerical techniques, we predict that intrinsic thermal quantum noise from the phonon reservoirs is a larger source of jitter and other perturbations than the gain-related Gordon-Haus noise, for short pulses, assuming typical fiber parameters. The size of the Raman timing jitter is evaluated for both bright and dark (topological) solitons, and is larger for bright solitons. Because Raman thermal quantum noise is a nonlinear, multiplicative noise source, these effects are stronger for the more intense pulses needed to propagate as solitons in the short-pulse regime. Thus Raman noise may place additional limitations on fiber-optical communications and networking using ultrafast (subpicosecond) pulses.

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