Journal ArticleDOI
Weakly guiding fibers.
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TLDR
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.Abstract:
Thin glass fibers imbedded into a glass cladding of slightly lower refractive index represent a promising medium for optical communication. This article presents simple formulas and functions for the fiber parameters as a help for practical design work. It considers the propagation constant, mode delay, the cladding field depth, and the power distribution in the fiber cross section. Plots vs frequency of these parameters are given for 70 modesread more
Citations
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Journal ArticleDOI
Optical fiber long-period grating sensors.
TL;DR: A novel class of highly sensitive sensors based on long-period fiber gratings that can be implemented with simple and inexpensive demodulation schemes are presented.
Journal ArticleDOI
Optical fibre long-period grating sensors: characteristics and application
Stephen W. James,Ralph P. Tatam +1 more
TL;DR: In this paper, the authors reviewed recent research on fiber optic long-period gratings (LPGs) with emphasis placed upon the characteristics of LPGs that make them attractive for applications in sensing strain, temperature, bend radius and external index of refraction.
Journal ArticleDOI
Modeling erbium-doped fiber amplifiers
TL;DR: Erbium-doped fiber amplifiers are modeled using the propagation and rate equations of a homogeneous two-level laser medium, and numerical methods are used to analyze the effects of optical modes and erbium confinement on amplifier performance.
Journal ArticleDOI
Loss analysis of single-mode fiber splices
TL;DR: In this paper, the authors consider the possibility that the two fibers of different dimensions are separated in longitudinal direction and are tilted or offset with respect to each other, and the trade-off between slice tolerances with regard to tilt and offset is expressed as an uncertainty principle.
Journal ArticleDOI
Cladding-mode resonances in short- and long-period fiber grating filters
TL;DR: In this article, the transmission of a mode guided by the core of an optical fiber through an ultraviolet-induced fiber grating when substantial coupling to cladding modes occurs is analyzed both experimentally and theoretically.
References
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Journal ArticleDOI
Bends in optical dielectric guides
TL;DR: In this article, light transmission through a curved dielectric rod of rectangular cross section embedded in different dielectrics is analyzed in closed-form, though approximate form, in three ranges: (i) small cross section guides such as a thin glass ribbon surrounded by air; making its width 1 percent of the wavelength, most of the power travels outside of the glass; the attenuation coefficient of the guide is two orders of magnitude smaller than that of glass; and the radius of curvature that doubles the straight guide loss is around 10,000Λ.
Journal ArticleDOI
Cylindrical Dielectric Waveguide Modes
TL;DR: In this article, the propagation of cylindrical dielectric waveguide modes near cutoff and far from cutoff is considered and the relative amounts of Ez and Hz, and the transverse components of the field are determined for both sets of hybrid modes.
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Radiation losses in glass optical waveguides
TL;DR: In this article, a single-mode waveguide with radiation losses of about 7 dB/km was constructed, which is very close to the intrinsic material scattering loss, with total losses between 60 and 70dB/km, allowing the measurement of bending losses at radii of curvature of a few centimeters.
Journal ArticleDOI
Degrees of freedom of an image.
TL;DR: In this paper, the maximum number of degrees of freedom of an image, which is usually derived by a rough application of the sampling theorem, has a precise mathematical meaning, established by applying the theory of prolate spheroidal functions.