Quantum noise in optical fibers I: stochastic equations

Details Quantum noise in optical fibers I: stochastic equations Quantum noise in optical fibers I: stochastic equations

1999-12-21

arxiv.org/abs/quant-ph/9912095v2

Physics

Quantum Physics

1 figure

Scientific paper

We analyze the quantum dynamics of radiation propagating in a single mode optical fiber with dispersion, nonlinearity, and Raman coupling to thermal phonons. We start from a fundamental Hamiltonian that includes the principal known nonlinear effects and quantum noise sources, including linear gain and loss. Both Markovian and frequency-dependent, non-Markovian reservoirs are treated. This allows quantum Langevin equations to be calculated, which have a classical form except for additional quantum noise terms. In practical calculations, it is more useful to transform to Wigner or +$P$ quasi-probability operator representations. These result in stochastic equations that can be analyzed using perturbation theory or exact numerical techniques. The results have applications to fiber optics communications, networking, and sensor technology.

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