SUNBELT
Member level 2
1.
Temperature dispersion of refractive indexes in some silicate fiberglasses
Ghosh, G.
Light & Radio Waves Section, Electrotech. Lab., Ibaraki;
Abstract
Temperature coefficients of refractive indexes dn/dT determine the temperature characteristics of an optical fiber transmission system. These coefficients are analyzed critically for the first time to find refractive indexes at different temperatures for three optical fiber glasses fused silica (SiO2), aluminosilicate and Vycor, and to predict therefrom the optical design parameters such as chromatic dispersion and zero-dispersion wavelength from the UV to the 1.7 μm region
2.
Temperature-dependent Sellmeier coefficients and chromaticdispersions for some optical fiber glasses
Ghosh, G. Endo, M. Iwasaki, T.
Light & Radio Waves Sect., Electrotech. Lab., Ibaraki;
Abstract
Temperature-dependent Sellmeier coefficients are necessary to optimize optical design parameters of the optical fiber transmission system. These coefficients are calculated for fused silica (SiO2 ), aluminosilicate, and Vycor glasses for the first time to find the temperature dependence of chromatic dispersion at any wavelength from UV to 1.7 μm. The zero dispersion wavelength λ0 (1.273 μm for SiO2, 1.393 μm for aluminosilicate, and 1.265 μm for Vycor glasses at 26°C) varies linearly with temperature, and dλ0/dT is 0.03 nm/K for aluminosilicate and Vycor glasses, whereas for SiO2 it is 0.025 nm/K. This study interprets the recently observed experimental value of dλ0/dT for two dispersion shifted optical fibers; and the dominantly material origin of dλ0/dT is confirmed here as a fundamental property of the optical fiber glasses
3.
Refractive index, optical dispersion, and group velocity of infrared waves in silica glass
C. Z. Tan, and J. Arndt
Abstract
An interferometric method was used for determination of the refractive index of silica glass in the infrared wavelength range by means of infrared spectroscopy. Refractive indices at the positions of successive interference fringes were determined in the wavelength region from 1.35 to 4.85 μm. The value of dn/dλ as a function of wavelength λ was evaluated which shows two maxima near 1.386 and 1.829 μm. The group velocity of the incident light as a function of wavelength was calculated
4.
Temperature dependence of refractive index of glassy SiO2 in the infrared wavelength range
C. Z. Tan, and J. Arndt
Abstract
An interferometric method was used for the determination of refractive index of glassy SiO2 in the infrared (IR) wavelength region (1.44<λ<4.77 μm) at temperatures ranging from 23.5 to 481°C by IR spectroscopy. The refractive index was found to increase with temperature at a given wavelength. Irregularities of the thermal coefficient of the refractive index (dn/dT) with temperature were observed and explained by the existence of crystal-like microstructures in silica glass. Optical dispersion (dn/dλ) exhibits a maximum at a given temperature. The wavelength at the maximum depends on temperature, showing irregularities with temperature like the thermal coefficient of refractive index
Temperature dispersion of refractive indexes in some silicate fiberglasses
Ghosh, G.
Light & Radio Waves Section, Electrotech. Lab., Ibaraki;
Abstract
Temperature coefficients of refractive indexes dn/dT determine the temperature characteristics of an optical fiber transmission system. These coefficients are analyzed critically for the first time to find refractive indexes at different temperatures for three optical fiber glasses fused silica (SiO2), aluminosilicate and Vycor, and to predict therefrom the optical design parameters such as chromatic dispersion and zero-dispersion wavelength from the UV to the 1.7 μm region
2.
Temperature-dependent Sellmeier coefficients and chromaticdispersions for some optical fiber glasses
Ghosh, G. Endo, M. Iwasaki, T.
Light & Radio Waves Sect., Electrotech. Lab., Ibaraki;
Abstract
Temperature-dependent Sellmeier coefficients are necessary to optimize optical design parameters of the optical fiber transmission system. These coefficients are calculated for fused silica (SiO2 ), aluminosilicate, and Vycor glasses for the first time to find the temperature dependence of chromatic dispersion at any wavelength from UV to 1.7 μm. The zero dispersion wavelength λ0 (1.273 μm for SiO2, 1.393 μm for aluminosilicate, and 1.265 μm for Vycor glasses at 26°C) varies linearly with temperature, and dλ0/dT is 0.03 nm/K for aluminosilicate and Vycor glasses, whereas for SiO2 it is 0.025 nm/K. This study interprets the recently observed experimental value of dλ0/dT for two dispersion shifted optical fibers; and the dominantly material origin of dλ0/dT is confirmed here as a fundamental property of the optical fiber glasses
3.
Refractive index, optical dispersion, and group velocity of infrared waves in silica glass
C. Z. Tan, and J. Arndt
Abstract
An interferometric method was used for determination of the refractive index of silica glass in the infrared wavelength range by means of infrared spectroscopy. Refractive indices at the positions of successive interference fringes were determined in the wavelength region from 1.35 to 4.85 μm. The value of dn/dλ as a function of wavelength λ was evaluated which shows two maxima near 1.386 and 1.829 μm. The group velocity of the incident light as a function of wavelength was calculated
4.
Temperature dependence of refractive index of glassy SiO2 in the infrared wavelength range
C. Z. Tan, and J. Arndt
Abstract
An interferometric method was used for the determination of refractive index of glassy SiO2 in the infrared (IR) wavelength region (1.44<λ<4.77 μm) at temperatures ranging from 23.5 to 481°C by IR spectroscopy. The refractive index was found to increase with temperature at a given wavelength. Irregularities of the thermal coefficient of the refractive index (dn/dT) with temperature were observed and explained by the existence of crystal-like microstructures in silica glass. Optical dispersion (dn/dλ) exhibits a maximum at a given temperature. The wavelength at the maximum depends on temperature, showing irregularities with temperature like the thermal coefficient of refractive index
