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Very broad bandwidth multimode optical fibre with an optimized core-cladding interface and reduced cladding effect

A multi-mode fiber and core technology, applied in the direction of graded index core/cladding fiber, multi-layer core/cladding fiber, cladding fiber, etc., can solve the problems that are not suitable for high-bandwidth applications

Active Publication Date: 2015-01-07
DRAKA COMTEQ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fiber described has a diameter of 60.5 μm and is not suitable for high bandwidth applications

Method used

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  • Very broad bandwidth multimode optical fibre with an optimized core-cladding interface and reduced cladding effect
  • Very broad bandwidth multimode optical fibre with an optimized core-cladding interface and reduced cladding effect
  • Very broad bandwidth multimode optical fibre with an optimized core-cladding interface and reduced cladding effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0051] The optical fiber of the present invention comprises a radius r having an alpha refractive index profile with respect to the outer optical cladding 1 central core multimode fiber. The optical fiber according to the present invention also includes t and the refractive index difference Δn relative to the outer optical cladding t of the recessed trench, thereby minimizing cladding effects. The combination of features of the invention ensures reduced cladding effects. The optical fiber of the present invention realizes an effective modal bandwidth (EMB) greater than 2000 MHz·km, even greater than 4700 MHz·km. This is explained in more detail below.

[0052] The ROB (Radial Offset Bandwidth) is determined in order to characterize cladding effects. This ROB constitutes parameters extracted from DMD measurements. DMD measurements were taken for injection conditions such that the spatial width of the input pulse was 5 μm + / - 0.5 μm at 850 nm and the distance between the p...

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Abstract

A multimode optical fibre comprising an optical core surrounded by an outer optical cladding, the optical core from the centre to the periphery: a central core having a radius (r 1 ) and an alpha-index profile with respect to an outer optical cladding, a depressed trench situated at the periphery of the central core having a width (w t ) and a refractive index difference (”n t ) with respect to the outer optical cladding, in which the diameter of the central core has a value of 50 ± 3 µm, the width (w t ) of the depressed trench is comprised between 0.5 µm and 2 µm, and the refractive index difference (”n t ) of the depressed trench with respect to the outer optical cladding is comprised between - 4×10 -3 and -1 ×10 -3 .

Description

technical field [0001] The present invention relates to the field of transmission over optical fibers, and more particularly, to multimode optical fibers for high bandwidth applications. Background technique [0002] An optical fiber conventionally consists of a core having the function of transmitting and optionally amplifying an optical signal, and an optical cladding having the function of confining the optical signal within the core. For this, the refractive index n of the core c and the refractive index of the cladding n g The relationship is n c >n g . [0003] The index profile represents a plot of a function relating the index of refraction of an optical fiber to its radius. The distance to the center of the fiber is conventionally shown on the x-axis, while the difference between the refractive index at this particular distance and that of the fiber cladding is shown on the y-axis. Generally, refractive index profiles are classified according to their appea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/028G02B6/036
CPCG02B6/0288G02B6/03627
Inventor D·莫兰K·德容P·西亚尔Y·吕米内奥
Owner DRAKA COMTEQ BV