Patent
Limited mode optical fiber
Melvin M. Ramsay,Philip W. Black +1 more
TLDR
In this paper, a single mode optical fiber having a central core region of uniform composition and thickness and core end regions each having a core with a graded composition and increasing thickness towards the ends of the fiber is presented.Abstract:
A single mode optical fiber having a central core region of uniform composition and thickness and core end regions each having a core with a graded composition and increasing thickness towards the ends of the fiber. The fiber maintains a constant normalized frequency with a minimum bending loss. Methods are also provided for forming the fibers from a fiber optic preform.read more
Citations
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Patent
Erbium-doped fiber amplifier
TL;DR: In this article, a rare earth doped optical amplifier with increased gain and lowered pump thresholds was proposed, achieving a saturation power of 11.3 dBm with only 54 mW of launch power at λ=1.49 μm.
Patent
Optical coupler comprising multimode fibers and method of making the same
Francois Gonthier,Lilian Martineau,Francois Seguin,Alain Villeneuve,Mathieu Faucher,Nawfel Azami,Marc Garneau +6 more
TL;DR: In this article, an optical coupler with a few-mode fiber in its centre is presented. And a method for making such a coupler is also provided, which includes the steps of bundling a central fewmode fiber with a plurality of multimode fibers and then fusing one end of such bundle and aligning it and splicing with a large core double-clad fiber, while preserving fundamental mode transmission from one to the other.
Patent
Expanded end optical fiber and associated coupling arrangements
TL;DR: In this article, an optical fiber is disclosed which comprises (a) a central core section of constant thickness which terminates in an outwardly gradually expanded end section, and (b) a cladding layer enveloping the core.
Patent
Single mode fiber with graded index of refraction
TL;DR: In this paper, the index of refraction of the core material is graded in the radial direction so as to yield an optical fiber with very low total dispersion and therefore high bandwidth.
Patent
Tapered optical fiber telescope, tracking system apparatus and method incorporating tapered optical fiber telescopes
TL;DR: In this article, an optical train consisting of a plurality of tapered optical fiber telescopes is described, where the output light from each telescope is received by a detecting device which generates a signal representative of information contained in the received light.
References
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Patent
Method of filtering modes in optical waveguides
TL;DR: In this article, both planar waveguide filters and fiber-optic filters are disclosed, as well as planar and fiber waveguide optical waveguide filter regions in a filter region in the waveguide.
Patent
Reduction of dispersion in a multimode fiber waveguide with core index fluctuations
TL;DR: In this article, a selection rule is imposed on the coupling in the fiber by providing the core index fluctuations with an azimuthal dependence governed by a function of the form cos p phi, where p is an integer equal to or greater than one.
Patent
Optical fiber having reduced dispersion
TL;DR: In this paper, a graded index optical fiber with a finite number of core layers is reduced by introducing slow longitudinal variations into the index of refraction of each layer, which varies between a maximum which is proximate in value to the minimum index of re-corpus of the more central radially adjacent layer and a minimum which is very close to the maximum index of this paper of the next furthermost radial adjacent layer.
Patent
Gradient refractive index light-conducting glass structure
Hiroyoshi Matsumura,Seiichi Ono +1 more
TL;DR: In this article, a light-conducting glass structure, the refractive index of which in each cross section perpendicular to the centre line or plane along which light is to advance of the structure, decreases progressively from the centreline or plane toward the outer surface of the structural structure, and the rate of decreasing the this article is smaller at the vicinity of at least either end surface being transverse to the center line and plane than that in the other part of the glass structure.