On two-wavelength Raman fibre laser based on spectral broadening

A.E. Bednyakova, M.P. Fedoruk, S.K. Turitsyn, A.S. Kurkov, O.I. Medvedkov

Research output: Chapter in Book/Published conference outputConference publication

Abstract

Raman fibre lasers and converters using the stimulated Raman scattering (SRS) in optical fibre waveguide are attractive for many applications ranging from telecommunications to bio-medical applications [1]. Multiple-wavelength Raman laser sources emitting at two and more wavelengths have been proposed to increase amplification spectrum of Raman fibre amplifiers and to improve noise characteristics [2,3]. Typically, a single fibre waveguide is used in such devices while multi-wavelength generation is achieved by employing corresponding number of fibre Bragg grating (FBG) pairs forming laser resonator. This approach, being rather practical, however, might not provide a good level of cross coherence between radiation generated at different wavelengths due to difference in FBGs and random phase fluctuations between the two wavelengths. In this work we examine a scheme of two-wavelength Raman fibre laser with high-Q cavity based on spectral intracavity broadening [3]. We demonstrate feasibility of such configuration and perform numerical analysis clarifying laser operation using an amplitude propagation equation model that accounts for all key physical effects in nonlinear fibre: dispersion, Kerr nonlinearity, Raman gain, depletion of the Raman pump wave and fibre losses. The key idea behind this scheme is to take advantage of the spectral broadening that occurs in optical fibre at high powers. The effect of spectral broadening leads to effective decrease of the FBGs reflectivity and enables generation of two waves in one-stage Raman laser. The output spectrum in the considered high-Q cavity scheme corresponds to two peaks with 0.2 - 1 nm distance between them.

Original languageEnglish
Title of host publication2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011
PublisherIEEE
Number of pages1
ISBN (Electronic)978-1-4577-0532-8
ISBN (Print)978-1-4577-0533-5
DOIs
Publication statusPublished - Sep 2011
Event2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference - Munich, Germany
Duration: 22 May 201126 May 2011

Conference

Conference2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference
Abbreviated titleCLEO EUROPE/EQEC 2011
CountryGermany
CityMunich
Period22/05/1126/05/11

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