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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.


Papers
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Journal ArticleDOI
01 Jan 2010-Optik
TL;DR: In this paper, the authors investigated theoretically the coupling optics involving a laser diode and an elliptic core monomode step index fiber via an upside down tapered lens on the tip of the fiber in absence and presence of possible transverse and angular misalignments.

21 citations

Patent
27 Jul 2005
TL;DR: In this article, a scheme of changing the symmetry of the fiber for reduced sensitivity of the fundamental mode of the first core section to resonance effects is disclosed, where a fundamental core mode couples less strongly with said cladding modes than higher order core modes.
Abstract: An active multimode optical fiber consisting of a first core section (11), a thin barrier layer (12) material having a thickness (d2) and a lower refractive index than the effective index of the first core section by an index difference (Δn), a second core section (13) having an effective index equal or higher than that of the first core section, and a cladding (14) having a refractive index lower than the effective index of the first core section. Said index difference and said thickness are selected so that a fundamental core mode couples less strongly with said cladding modes than higher order core modes. A scheme of changing the symmetry of the fiber for reduced sensitivity of the fundamental mode of the first core section to resonance effects is disclosed.

21 citations

Patent
27 Sep 2002
TL;DR: In this paper, the authors proposed a multilayered reflection reducing film and an electronic image display device in which degradation in the appearance due to the interference of light can be suppressed and the reflectance can be decreased.
Abstract: PROBLEM TO BE SOLVED: To provide a reflection reducing film and an electronic image display device in which degradation in the appearance due to the interference of light can be suppressed and the reflectance can be decreased. SOLUTION: The reflection reducing film has a multilayered structure formed on one or both surfaces of a transparent resin film, with the multilayered structure composed of, from the outermost layer, a reflection reducing layer comprising at least a low refractive index layer and a high refractive index layer, a hard coat layer and a first interference layer. The maximum of the peak-to- peak difference of the reflectance in the region from 500 to 650 nm is ≤1.0%. It is preferable that the refractive index of the transparent resin film ranges from 1.55 to 1.70, that the refractive index and optical film thickness of the first interference layer range from 1.50 to 1.65 and 125 to 160 nm, respectively, and that the refractive index and the film thickness of the hard coat layer range from 1.45 to 1.55 and from 2 to 25 μm, respectively. The refractive index of each layer preferably satisfies the relation of (refractive index of the transparent resin film)>(refractive index of the first interference layer)>(refractive index of the hard coat layer). COPYRIGHT: (C)2003,JPO

21 citations

Journal ArticleDOI
TL;DR: In this article, a method for reconstructing the refractive index profile of diffused waveguides on the basis of inversion of the WKB formula was proposed, which can be used to reconstruct equally accurately both parabolic and exponential profiles.
Abstract: A description is given of a method for reconstructing the refractive index profile of diffused waveguides on the basis of inversion of the WKB formula. It is shown that this method can be used to reconstruct equally accurately both parabolic and exponential profiles. Additional data (the mode spectrum determined at several wavelengths and the effects of different coatings on a waveguide) make it possible to find the profiles of few-mode waveguides. Determination of the effective refractive indices of the TE and TM modes for two directions of propagation in the plane of an anisotropic waveguide gives the necessary data for the reconstruction of the profile of all the components of the permittivity tensor.

21 citations

Patent
21 Sep 2007
TL;DR: In this paper, a large diameter core (d1 up to 60μm) and a first cladding (d2) where the difference between refractive index (n1 ) in the core and the first claddings (n2) is very small (Δn 0.4) (n3 is preferably less than 1.3).
Abstract: A large mode area optical fiber includes a large diameter core (d1 up to 60μm), and a first cladding (diameter d2) wherein the difference between refractive index (n1 ) in the core and the first cladding (n2) is very small (Δn 0.4) (n3 is preferably less than 1.3). The small change in refractive index between the core and inner cladding combined with a large change in refractive index between the first cladding and second cladding provides a significantly improved single mode holding waveguide.

21 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202318
202236
20219
202011
201913
201814