Journal ArticleDOI
Laser beam refraction traversely through a graded-index preform to determine refractive index ratio and gradient profile.
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TLDR
Comparison between the experimental results and the ray trace calculations using an interative curve-fitting procedure gave nondestructive determinations of the refractive index ratio Delta and index gradient profile parameter alpha as well as measurement of the core dimensions.Abstract:
A technique is described which permits the determination of geometric and refractive index characteristics of graded-index preforms from measurements of the refraction of rays traced through the preform perpendicular to the preform axis. A computer program was developed to trace rays through graded-index preforms to display the refracting effect of the index properties and relate the ray incidence angle to its deflection in traversing the preform. An experimental apparatus has been developed in which a narrow beam of laser radiation is directed at the preform and its deflection angle measured. Comparison between the experimental results and the ray trace calculations using an interative curve-fitting procedure gave nondestructive determinations of the refractive index ratio Delta and index gradient profile parameter alpha as well as measurement of the core dimensions.read more
Citations
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Journal ArticleDOI
Triangular-profile single-mode fiber
TL;DR: A low-loss triangular-profile single-mode fiber is reported, which has a low fiber loss at 1.3-1.55microm wavelengths and its zero-chromatic-dispersion wavelength is 1.402 microm.
Journal ArticleDOI
Germanium chemistry in the MCVD process for optical fiber fabrication
TL;DR: In this article, the authors investigated the chemistry of germanium incorporation in the glass by infrared spectrophotometric analysis of the effluent gases, and by measurement of the properties of preforms and fibers produced by the process.
Journal ArticleDOI
Determination of the refractive-index profile of light-focusing rods: accuracy of a method using Interphako interference microscopy
Yasuji Ohtsuka,Yasuhiro Koike +1 more
TL;DR: It is concluded that Analysis (I) is preferable to Analysis (II) when n(p) not equal n(2) and that the improved partial splitting procedure is a practicable method for determining the index profile of a LFR.
Journal ArticleDOI
Optical fiber and preform profiling technology
TL;DR: A comprehensive review of state-of-the-art optical fiber and pre-form index profiling methods has been prepared in this article, where the advantages and disadvantages of various approaches are discussed.
Journal ArticleDOI
B.S.T.J. brief: Experimental verification of ultra-wide bandwidth spectra in double-clad single-mode fiber
TL;DR: In this article, a double-cladding single-mode fiber was constructed by using an inner cladding to form an index well between the core and a pure silica outer cladding, and a computer-aided analytical procedure was used to choose the proper fiber diameter to cancel material dispersion at predetermined wavelengths.
References
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Journal ArticleDOI
Scattering from side-illuminated clad glass fibers for determination of fiber parameters
TL;DR: In this article, the theoretical characteristics of the scattered light pattern from a clad glass fiber illuminated by a laser beam perpendicular to its axis agree closely with results of experimental measurements of the scattering light.
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Nondestructive measurement of index profile of an optical-fibre preform
TL;DR: In this paper, a simple and fast non-destructive method of measuring the index profile of an optical-fibre preform is presented, where a laser beam is shone perpendicularly to the preform axis, and the exit angle of its backscattered ray is recorded as a function of the distance of the incident ray from the horizontal axis.
Journal ArticleDOI
Ray Tracing in Gradient-Index Media
TL;DR: In this article, the authors deal with practical methods of tracing rays through a gradient-index element, one in which the refractive index varies appreciably in a layer just below the surface of the glass.
Journal ArticleDOI
Refractive-index profile of an optical fiber: its measurement by the scattering-pattern method.
T. Okoshi,Kazuo Hotate +1 more
TL;DR: A new method for determining the refractive-index profile in an optical fiber from its scattering pattern for a normally incident laser beam is described, and the profile obtained shows good agreement with design data.