Journal ArticleDOI
Propagation in Doubly Clad Single-Mode Fibers
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TLDR
In this paper, general propagation properties and universal curves are given for doubly clad single-mode fibers with inner cladding index higher or lower than outer claddings index, using the two parameters inner cladd/core radii ratio and inner clacking/core index differences ratio.Abstract:
General propagation properties and universal curves are given for doubly clad single-mode fibers with inner cladding index higher or lower than outer cladding index, using the two parameters inner cladding/core radii ratio and inner cladding/core index differences ratio. LP01, LP11, and LP02 cutoff conditions are examined. It is shown that dispersion properties largely differ from the singly clad single-mode fiber case, leading to large new possibilities for low-loss dispersion-free fibers at any wavelength between 1.3 and 1.7 µm.read more
Citations
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Thinned fiber Bragg gratings as high sensitivity refractive index sensor
TL;DR: In this paper, the numerical and experimental analysis on the use of thinned fiber Bragg gratings as refractive index sensors have been carried out, where wet chemical etching in a buffered hydrofluoric acid solution was used for sensor fabrication.
Journal ArticleDOI
Thinned fiber Bragg gratings as refractive index sensors
TL;DR: In this article, a novel approach based on the selective etching along the grating region has been analyzed, leading to high-sensitivity refractive index sensors based on intensity measurements.
Journal ArticleDOI
Generalized expression for the growth of long period gratings
TL;DR: In this article, the waveguide dispersion characteristics of the core and clad effective indices play a key role in the evolution of the transmission characteristics of a grating, and an expression is derived and verified experimentally to explain this phenomena.
Journal ArticleDOI
Fiber refractometer based on a fiber Bragg grating and single-mode-multimode-single-mode fiber structure.
TL;DR: A refractive index (RI) sensor based on a novel fiber structure that consists of a single-mode-multimode-single-mode (SMS) fiber structure followed by a fiber Bragg grating was demonstrated.
Journal ArticleDOI
Coated long-period fiber gratings as high-sensitivity optochemical sensors
Andrea Cusano,Agostino Iadicicco,P. Pilla,L. Contessa,Stefania Campopiano,Antonello Cutolo,Michele Giordano,Gaetano Guerra +7 more
TL;DR: In this paper, the numerical and the experimental analyses of coated long-period fiber gratings (LPFGs) as a high-sensitivity optochemical sensor are presented, which relies on LPFGs coated with nanoscale high refractive index chemical-sensitive overlays.
References
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Journal ArticleDOI
Weakly guiding fibers.
TL;DR: Simple formulas and functions for the fiber parameters are presented as a help for practical design work that considers the propagation constant, mode delay, the cladding field depth, and the power distribution in the fiber cross section.
Journal ArticleDOI
Ultimate low-loss single-mode fibre at 1.55 μm
TL;DR: In this article, a very low loss singlemode fiber with a minimum loss of 0.20 dB/km at a wavelength of 1.55 μm is attained; this loss reaches the ultimate lower loss limit of silica-based optical glass fibre.
Journal ArticleDOI
Modes of optical waveguides
Allan W. Snyder,William R. Young +1 more
TL;DR: In this article, a simple method is presented for finding the modes on those optical waveguides with a cladding refractive index that differs only slightly from the core, and the resulting modal fields and their progagation constants display the polarization properties of the waveguide contained within the ∇ ∊ term of the vector wave equation.
Journal ArticleDOI
Dispersion in Weakly Guiding Fibers
TL;DR: Optical signals transmitted through cladded glass fibers are subject to delay distortion because of dispersion in the material, dispersion caused by the waveguide characteristic, and delay differences between modes.
Journal ArticleDOI
Characteristics of a doubly clad optical fiber with a low-index inner cladding
Shojiro Kawakami,S. Nishida +1 more
TL;DR: In this article, a novel type of optical fiber which is composed of three portions: the core, inner cladding, and outer cladding was investigated, and it is assumed that the core has the largest refractive index of the three, and the outer claddings index is the next largest.