scispace - formally typeset
Search or ask a question
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.


Papers
More filters
Patent
03 Feb 2009
TL;DR: Laterally emitting step index fibers are produced from preforms that comprise inlay rods, in which the scatter centers are embedded and which coat the outside region of the fiber core during fiber drawing as mentioned in this paper.
Abstract: The invention relates to laterally emitting step index fibers, preforms and methods for the production thereof and to fiber bundles and sheet material comprising laterally emitting step index fibers and to the use thereof. The laterally emitting step index fibers comprise scatter centers (3) between the core (1) and jacket (2) that ensure light decoupling from the fiber. The laterally emitting step index fibers are produced from preforms that comprise inlay rods, in which the scatter centers are embedded and which coat the outside region of the fiber core during fiber drawing. Alternatively, at least one inlay tube can be used.

18 citations

Journal ArticleDOI
TL;DR: In this paper, a polystyrene (PS)-based costless polymer matrix for graded index polymer optical fibers (GI POFs) with low attenuation at a wavelength of 670 nm was selected.
Abstract: Polystyrene (PS) was selected as a costless polymer matrix for graded index polymer optical fibers (GI POFs) with low attenuation at a wavelength of 670 nm. However, fabricated PS-based GI POFs showed attenuation of more than 300 dB/km. This high attenuation PS-based GI POF had a quite broad molecular weight distribution. In contrast, a PS-based GI POF with a narrow molecular weight distribution showed low attenuation of around 160 dB/km. This is because the refractive index of PS, different from general polymers, is greatly affected by the molecular weight. The PS-based GI POF showed the high thermal stability of this low loss performance at a temperature of 70°C , despite the low glass transition temperature caused by plasticization. The measured refractive index profile was near optimum (g=2.5), and a high bandwidth of 5.8 GHz for a 50 m length was obtained.

17 citations

Patent
23 Feb 2001
TL;DR: In this paper, a lower-dispersion optical fiber achieving both low wavelength dispersion in the usable wavelength region and enlarged effective core cross-section is considered, where the outer peripheral face of a center core (1) is covered with a first side core (2) and the outer peripherals of the second side core(3) are covered by a clad (4).
Abstract: A lower-dispersion optical fiber achieving both low wavelength dispersion in the usable wavelength region and enlarged effective core cross-section The outer peripheral face of a center core (1) of the lower dispersion optical fiber is covered with a first side core (2) the outer peripheral face of the first side core (2) is covered with a second side core (3), and the outer peripheral face of the second side core (3) is covered with a clad (5) If the maximum refractive index of the center core (1) is n1, the minimum refractive index of the first side core (2) is n2, the maximum refractive index of the second side core (3) is n3, and the refractive index of the clad (5) is nc, a relation n1 > n3 > nc > n2 is satisfied The relative refractive-index differences Δ1, Δ2, and Δ3 of the maximum refractive index of the center core (1), and the minimum refractive index of the first side core (2) to tose of the clad (5) are, respectively, in the ranges of 04 % ≤ Δ1 ≤ 07 %, -030 % ≤ Δ2 ≤ -005 %, and 02 % ≤ Δ3

17 citations

Patent
12 Mar 2002
TL;DR: In this paper, a novel group of cladding and core designs, especially for use in optical fibres, which provides enhanced dispersion compensating properties through waveguiding of higher-order modes, was proposed.
Abstract: The present invention relates to a novel group of cladding and core designs, especially for use in optical fibres, which provides enhanced dispersion compensating properties through waveguiding of higher-order modes. In a first aspect, the present invention relates to an optical fibre comprising: A central region (41) having a centre radius r centre, max and an effective refractive index ncentre.eff • A core region (43), having a core radius rcore-max,a maximum refractive index ncore,max, and an effective refractive index ncore,eff • A cladding region (45, 46) having a cladding radius rciadding,max, a maximum refractive index nclad,max, an effective refractive index nciad,effand/or a resultant geometrical index ng,clad In preferred embodiments, the core region and or the cladding region comprise a photonic crystal structure.

17 citations

Journal ArticleDOI
TL;DR: A new method of measuring the refractive indices of nanoparticles based on refractive index matching between nanoparticles and surrounding organic solvents is proposed, which can support practical applications for nanomaterials in optical and optoelectronic applications.
Abstract: A new method of measuring the refractive indices of nanoparticles has been proposed based on refractive index matching between nanoparticles and surrounding organic solvents. By finding the most transparent point of the transmittance spectrum, the refractive index of the nanoparticles is equal to that of the solvents at the corresponding wavelength. Utilizing a Rayleigh scattering model, the effects of refractive index mismatching (Δn) on the transmittance are investigated under different conditions. Some criteria for getting highly transparent nanoparticle dispersion and accurate refractive index measurements are suggested, which can support practical applications for nanomaterials in optical and optoelectronic applications.

17 citations


Network Information
Related Topics (5)
Optical fiber
167K papers, 1.8M citations
89% related
Photonic crystal
43.4K papers, 887K citations
88% related
Laser
353.1K papers, 4.3M citations
85% related
Resonator
76.5K papers, 1M citations
84% related
Light scattering
37.7K papers, 861.5K citations
83% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202318
202236
20219
202011
201913
201814