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Optics Letters

Optics Letters


  • Vol. 29, Iss. 5 — Mar. 1, 2004
  • pp: 445–447

Raman-noise-induced noise-figure limit for χ(3) parametric amplifiers

Paul L. Voss and Prem Kumar  »View Author Affiliations

Optics Letters, Vol. 29, Issue 5, pp. 445-447 (2004)

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The nonzero response time of the Kerr [χ(3)] nonlinearity determines the quantum-limited noise figure of χ(3) parametric amplifiers. This nonzero response time of the nonlinearity requires coupling of the parametric amplification process to a molecular-vibration phonon bath, causing the addition of excess noise through Raman gain or loss at temperatures above 0 K. The effect of this excess noise on the noise figure can be surprisingly significant. We derive analytical expressions for this quantum-limited noise figure for phase-insensitive operation of a χ(3) amplifier and show good agreement with published noise-figure measurements.

© 2004 Optical Society of America

OCIS Codes
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(270.5290) Quantum optics : Photon statistics

Paul L. Voss and Prem Kumar, "Raman-noise-induced noise-figure limit for χ(3) parametric amplifiers," Opt. Lett. 29, 445-447 (2004)

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