Temperature dependence of refractive index of glassy SiO 2 in the infrared wavelength range

Temperature impairment characterization in radio-over-multimode fiber systems

“…It should be outlined that a thermal coefficient of around 1.5 × 10 −4°C−1 for the core and cladding refractive indices, respectively, has been reported by several authors 11,19,20,25 but having a negligible influence on the frequency response (and so on the high-order resonances) for the temperature ranges considered, and simulations with the model reported here are consistent with this fact. In contrast, for a similar temperature range, deviations of around units (in percentage from the nominal value)of the graded index exponent α,due to the influence of temperature on the silica properties, have been reported.…”

“…11,17,18 For instance, focusing on silica-based optical fibers, a positive thermal coefficient, dn i ∕dT of both refractive indices has been observed. 19,20 This fact also imposes a great challenge for the extension of this bandwidth dependent MMF performance and, conse-quently, it is necessary to estimate its effect over the broad-band transmission bands. Up to now, most temperature analysis are devoted to capability of uncooled laser diode to keep linearity in a wide temperature range 21,22 allowing competitive prices of the whole system.…”

The temperature coefficient of the optical path length as a function of the temperature in different optical glasses

“…The increase of dS/dT observed in the Cr doped sample, measured in k = 632.8 nm, we attribute to the increase in the electronic polarizability in the wavelengths where the optical absorption bands of this doping ion occur, similarly to the previous observations in iron doped silicate glasses [4][5][6][7][8][9][10][11]. This effect on dS/dT as a function of wavelength has also been observed in other glass systems [4,19,20].…”

Measurements of radiation characteristics of fused quartz containing bubbles

“…Different correlations for the real part of the complex index of refraction of fused quartz as a function of wavelength have been suggested in the literature [28][29][30] for different spectral regions.…”