Enhanced Raman gain of Ge–Ga–Sb–S chalcogenide glass for highly nonlinear microstructured optical fibers

Abstract

The off-resonance Raman spectra of As2S3, GeS2, Ge25Ga5S70, Ge23As12S65, Ge23Sb12S65, and Ge17Ga4Sb10S69 chalcogenide glasses have been recorded and the corresponding Raman gain coefficients have been calculated in order to evaluate the role of Ge, Ga, Sb, and As on a novel Ge17Ga4Sb10S69 glass proposed for highly nonlinear microstructured optical fibers. We calculated the Raman response functions of As2S3n2=2.3×10−17 m2/W, G∼2.78×10−11 m/W; and Ge17Ga4Sb10S69 n2=1.8×10−17 m2/W, G∼1.57×10−11 m/W glasses. The supercontinuum generation of a three-air-hole Ge17Ga4Sb10S69 fiber was simulated, challenging the properties of a similar fiber design made of As2S3 chalcogenide glass. We calculated the zero dispersion wavelengths of Ge17Ga4Sb10S69 fibers with the core diameters of 1.2, 1.5, and 2.0 μm at λ=1.48, 1.66, and 1.75 μm in comparison with λ=1.60, 1.87, and 1.98 μm obtained for As2S3 fibers.