Topic
Step-index profile
About: Step-index profile is a research topic. Over the lifetime, 3104 publications have been published within this topic receiving 53199 citations.
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TL;DR: In this paper, a measurement of the critical dimension where the macroscopic definition of refractive index could be applied at nanometric scale is reported, where a fluorescent nanolayer is used as a local probe of the local probe via its radiative lifetime.
Abstract: This Brief Report reports a measurement of the critical dimension where the macroscopic definition of refractive index could be applied at nanometric scale. A fluorescent nanolayer is used as a local probe of the refractive index via its radiative lifetime. By covering the emitting layer with nanofilms of high refractive index material the sphere radius $R$ in which the effective-medium theory has to be applied is estimated as $\ensuremath{\lambda}/4$ in air.
45 citations
Journal Article•
TL;DR: In this paper, the authors examined the refractive index changes near the absorption edge in semiparabolic quantum wells as a function of the incident optical intensity, and an analytic formula for the changes in the this paper was obtained by using the compact-density matrix approach and an iterative method.
45 citations
TL;DR: In this article, the dispersion characteristics of step-index and quadratic profile fibers with core-cladding, core, and cladding nonlinearity were investigated and it was shown that although the propagation constant increases substantially from the linear value, the group delay and waveguide dispersion do not increase as much.
Abstract: Chromatic dispersions of optical fibers with Kerr-effect nonlinearity are investigated. Under high optical intensity, dispersion characteristics become different from those of the linear state (or weak optical intensity) since the refractive index profile changes in accordance with the intensity profile. Nonlinear dispersion characteristics are calculated for step-index and quadratic profile fibers with core-cladding, core, and cladding nonlinearity. It is shown that although the propagation constant of the step-index fiber increases substantially from the linear value, the group delay and waveguide dispersion do not increase as much. >
45 citations
Patent•
25 Mar 1994TL;DR: In this paper, an achromatic fiber optic coupler of the type wherein a plurality of singlemode optical fibers, each having a core and a cladding, are fused together along a portion of the lengths thereof to form a coupling region is presented.
Abstract: An achromatic fiber optic coupler of the type wherein a plurality of single-mode optical fibers, each having a core and a cladding, are fused together along a portion of the lengths thereof to form a coupling region. The propagation constants of the fibers are preferably equal; however if the fiber claddings have different refractive indices, the lowest cladding refractive index is n 2 . A matrix glass body of refractive index n 3 surrounds the coupling region, n 3 being lower than n 2 by such an amount that the value of Δ 2-3 is less than 0.125%, wherein Δ 2-3 equals (n 2 2- n 3 2 )2n 2 2 .
45 citations
TL;DR: In this paper, refractive index versus composition data for three silica based binary glass systems SiO2-B2O3, SiO 2-P2O5 and SiO O2-GeO2 are presented.
Abstract: Refractive index versus composition data are presented for three silica based binary glass systems SiO2-B2O3, SiO2-P2O5 and SiO2-GeO2. Using a near-field scanning method refractive index measurements were made on graded-index optical fibres, of known composition, fabricated by the chemical vapour deposition technique. The experimental data for each glass system is also compared with theoretical predictions of refractive index versus composition made from a single oscillator, Sellmeier model involving an oscillator energy and a dispersion energy term.
45 citations