Noise-figure limit of fiber-optical parametric amplifiers and wavelength converters: Experimental investigation

Renyong Tang*, Paul L. Voss, Jacob Lasri, Preetpaul Devgan, Prem Kumar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

Recent theoretical work predicts that the quantum-limited noise figure of a X(3)-based fiber-optical parametric amplifier operating as a phase-insensitive in-line amplifier or as a wavelength converter exceeds the standard 3-dB limit at high gain. The degradation of the noise figure is caused by the excess noise added by the unavoidable Raman gain and loss occurring at the signal and the converted wavelengths. We present detailed experimental evidence in support of this theory through measurements of the gain and noise-figure spectra for phase-insensitive parametric amplification and wavelength conversion in a continuous-wave amplifier made from 4.4 km of dispersion-shifted fiber. The theory is also extended to include the effect of distributed linear loss on the noise figure of such a long-length parametric amplifier and wavelength converter.

Original languageEnglish (US)
Pages (from-to)2372-2374
Number of pages3
JournalOptics Letters
Volume29
Issue number20
DOIs
StatePublished - Oct 15 2004

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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