Refractive index dispersion of doped silica for fiber optics

Refractive index and density changes in silica glass by halogen doping

“…Since silica glass has a flexible structure, n and q vary widely with structural or/and compositional change(s). Although various techniques to control n have been suggested, such as compression-induced densification [1,2], high-energy irradiations [3], and so on, doping is the most common method for efficient change in n. Many types of dopants have been reported [4][5][6][7].…”

On the precision of mode delays derivation with the use of the WKB method

“…The dopant responsible for the profile of refraction shaping was exclusively Germanium. We used Sellmeier coefficients presented in (Butov and Golant 2002). The Germanium profile was derived to obtain the parameter 1.998 at 1 lm wavelength.…”

“…(10) and (11) X stands for the mole fraction of Ge which shapes the desired refractive index profile. In the forthcoming calculations we used the Sellmeier coefficients a (Butov and Golant 2002). In this paper we compare results obtained with the use of the WKB method with the finite-element method (FEM) used as a reference.…”

PEPSI-feed: linking PEPSI to the Vatican Advanced Technology Telescope using a 450m long fibre

“…4a and 4b for a core-doped GeO 2 (11.2 mol %) fibre. 5 The f-ratio increases (decreases) towards longer (shorter) wavelength, i.e., it is possible to couple blue light with even faster input f-ratios. Figure 4c shows the number of modes for the same fibre for constant input f-ratio of 3.2.…”