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 article, a simple and accurate method is presented for experimental characterisation of graded-index single-mode fibres using their far-field radiation patterns and the equivalent-step? method.
Abstract: A simple and accurate method is presented for experimental characterisation of graded-index single-mode fibres using their far-field radiation patterns and the `equivalent-step? method
22 citations
Patent•
06 Jan 1976
TL;DR: In this paper, an optical power divider for single mode optical fibers is described, where the fibers to be coupled are inserted in converging bores in a lower refractive index glass block which is collapsed about the fibers and drawn down.
Abstract: An optical power divider is disclosed for single mode optical fibers. The fibers to be coupled are inserted in converging bores in a lower refractive index glass block which is collapsed about the fibers and drawn down. In the drawn down region the fibers are reduced in cross-section so that an appreciable proportion of the optical energy will be guided by the fibers while propagating in the surrounding lower refractive index glass block.
22 citations
TL;DR: This paper presents an approximate theory for determining the reflection losses in multimode fibers that terminate in end surfaces that are not strictly perpendicular to the fiber axis and is applicable to tilts and covers step index as well as parabolic index fibers.
Abstract: This paper presents an approximate theory for determining the reflection losses in multimode fibers that terminate in end surfaces that are not strictly perpendicular to the fiber axis. This theory is also applicable to tilts and covers step index as well as parabolic index fibers. The cross section of the step index fiber is assumed to have square geometry. This assumption simplifies the theory and is not expected to influence the obtained results.
22 citations
Patent•
16 Dec 1999TL;DR: In this paper, the peak ratio of the difference in refractive index between the core part and pure silica to the refractive indices of pure silicas is greater than 0.05 %.
Abstract: An optical fiber has a structure that can effectively decrease both transmission and bending losses. The optical fiber is composed mainly of silica and includes a core part and cladding part surrounding the core part. The core part contains chlorine to have a larger refractive index than that of pure silica, and the cladding part contains fluorine to have a smaller refractive index than that of pure silica. The peak ratio of the difference in refractive index between the core part and pure silica to the refractive index of pure silica is greater than 0.05 %.
22 citations
TL;DR: In this article, a novel approach to measure in-situ refractive index changes induced by gamma radiation in single mode fibers is proposed, which is derived from wavelength shifts of resonances of a CO2 laser written long period fiber grating.
Abstract: We propose a novel approach to measure in-situ refractive index changes induced by gamma radiation in single mode fibers. The changes are derived from wavelength shifts of resonances of a CO2 laser written long period fiber grating. Using this approach, we estimate the radiation induced refractive index increase in the core of B/Ge co-doped fiber as 2.1×10-5 at 10 kGy and 1.85×10-4 at 1.54 MGy. At doses , the index changes are considered to be governed by glass polarizability changes. Numerical simulations show that saturation of the index change can be observed at doses . Irradiation has a negligible effect on the resonance dip strengths and bandwidths, with the exception of the turnaround point mode.
22 citations