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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: A new nondestructive technique is presented for determining the refractive index profile of an optical fiber from its backscattered pattern arising from a normally incident laser beam to the fiber axis.
Abstract: A new nondestructive technique is presented for determining the refractive index profile of an optical fiber from its backscattered pattern arising from a normally incident laser beam to the fiber axis. The proposed method requires no sample preparation or index matching liquid. The principle of the method is to construct a deflection function from the measured pattern. The index profile can then be determined by the inversion of an Abel integral equation. Good agreement is obtained between the index profile determined by this technique and that measured by the near-field scanning technique.
23 citations
Patent•
19 Aug 2010
TL;DR: In this article, an improved multimode fiber optic cable was proposed to compensate for a radially dependent wavelength distribution of laser launch modes coupled into the multimode optic cable in order to minimize modal dispersion within the multimodal fiber optic cables.
Abstract: An improved multimode fiber optic cable is provided. The improved multimode fiber optic cable includes, but is not limited to, a refractive index profile which is designed to compensate for a radially dependent wavelength distribution of laser launch modes coupled into the multimode fiber optic cable in order to minimize modal dispersion within the multimode fiber optic cable. The differential mode delay (DMD) is adjusted as a function of the radius effect by modifying the alpha-profile of the refractive index.
23 citations
Patent•
10 Feb 2003TL;DR: In this paper, a pressure sensor for an anti-pinch device in the motor vehicle industry is described, where the fiber guide is pressed against the optical fiber such that the condition for the total reflection required for the normal optical waveguidance in the optical waveguide is no longer fulfilled, and attenuation takes place.
Abstract: A pressure sensor includes an optical waveguide having an optical fiber with a refractive index n1, located in a fiber guide with a refractive index n3, forming an intermediate region. A medium with a refractive index n2 is located in the intermediate region. The refractive indices correspond to the relation n3 > n1 > n2. When subjected to a pressure, the fiber guide is pressed against the optical fiber such that the condition for the total reflection required for the normal optical waveguidance in the optical waveguide is no longer fulfilled, and attenuation takes place. The attenuation is evaluated in a corresponding control unit. The pressure sensor is especially provided for an anti-pinch device in the motor vehicle industry.
22 citations
TL;DR: In this paper, a numerical model of the refractive properties of the human eye is given, where the crystalline lens is presented in the form of hundreds of shells with rotational symmetry.
22 citations
22 citations