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1. WO1980001958 - MULTIMODE FIBER WITH 2-DEPENDENT INDEX PROFILE

Publication Number WO/1980/001958
Publication Date 18.09.1980
International Application No. PCT/US1980/000209
International Filing Date 03.03.1980
IPC
G02B 6/028 2006.01
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
02Optical fibre with cladding
028with core or cladding having graded refractive index
CPC
G02B 6/02285
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides
02Optical fibre with cladding ; with or without a coating
02214tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
02285Characterised by the polarisation mode dispersion [PMD] properties, e.g. for minimising PMD
G02B 6/0288
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides
02Optical fibre with cladding ; with or without a coating
028with core or cladding having graded refractive index
0288Multimode fibre, e.g. graded index core for compensating modal dispersion
G02B 6/03627
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides
02Optical fibre with cladding ; with or without a coating
036core or cladding comprising multiple layers
03616Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
03622having 2 layers only
03627arranged - +
G02B 6/03633
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides
02Optical fibre with cladding ; with or without a coating
036core or cladding comprising multiple layers
03616Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
03622having 2 layers only
03633arranged - -
Applicants
Inventors
Priority Data
2099416.03.1979US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) MULTIMODE FIBER WITH 2-DEPENDENT INDEX PROFILE
(FR) FIBRE MULTIMODE AVEC PROFILE D"INDEX A DEPENDANCE 2
Abstract
(EN)
Increased mode dispersion in graded-index multimode optical fibers due to defects in the index profile can be significantly reduced if the average defect is caused to varnish over the length of the fiber. For fibers with non-optimum (Alpha)-values, minimum impulse response can be achieved when (Alpha) varies along the fiber, such that the average value of (Alpha) is equal to (Alpha)opt. The effect of fluctuations superimposed upon the index profile are minimized by introducing an odd number of phase reversals in the fluctuations equally spaced along the fiber.
(FR)
La dispersion accrue du mode dans les fibres optiques multimodes a index gradue due aux defauts du profil d"index peut etre sensiblement reduite si le defaut moyen disparait sur la longueur de la fibre. Pour des fibres avec des valeurs (Alpha) non optimum, une reponse a impulsion minimum peut etre obtenue lorsque (Alpha) varie le long de la fibre, de sorte que la valeur moyenne d" (Alpha) soit egale a (Alpha) opt. L"effet des fluctuations superposees sur le profil d"index sont reduites au minimum en introduisant un nombre impair d"inversement de phases dans les fluctuations egalement espaces le long de la fibre.
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