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Multimode Fiber Having Improved Index Profile

a multi-mode optical fiber and index profile technology, applied in the field of optical fibers, can solve the problems of reducing signal quality, difficult control of dopant concentrations in the outer regions of the core where the concentrations are smallest, and most mmf's not showing ideal parabolic refractive index profiles, etc., to achieve the effect of improving the performance of mmf and improving the performance of measured system performan

Pending Publication Date: 2021-02-25
PANDUIT
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Benefits of technology

The patent text proposes a way to improve the performance of optical channel links by altering the refractive index profile in the fiber. This modification has been shown to improve system performance by reducing total dispersion.

Problems solved by technology

This degrades signal quality.
However in practice, due to difficulties in controlling low dopant concentrations during the manufacturing process, most MMF's do not exhibit ideal parabolic refractive index profiles.
In particular, dopant concentrations in the outer regions of the core where the concentrations are smallest are most challenging to control.
As a result, higher order modes often exhibit variations in mode delay in comparison to those modes propagating along the inner regions of the core.

Method used

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  • Multimode Fiber Having Improved Index Profile
  • Multimode Fiber Having Improved Index Profile
  • Multimode Fiber Having Improved Index Profile

Examples

Experimental program
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Effect test

Embodiment Construction

[0018]The number of modes N, supported by the MMF is given by,

N0=αα+2n102k02R2Δ0

[0019]Where, k0=2π / λ0, is the wave number for light having wavelength λ0 in free space. By changing the targeted value of the refractive index profile whereby it decreases to a lower than ideal parabolic value at increasing radial distance in the core, improved fiber performance is achieved. According to one embodiment, the value of the refractive index profile is decreased below an ideal parabolic index profile. According to a preferred embodiment, the refractive index profile is decreased continuously and monotonically. In some embodiments, the target refractive index profile is altered above a specific core radius ri. For example, in one embodiment, the target refractive index profile is altered for core radii greater than 5 μm such that the refractive index profile is smaller than the profile following a power law function (as shown in FIG. 5). In another embodiment, the target refractive index profi...

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Abstract

A graded index multimode fiber and method of producing the graded index multimode fiber utilize a technique of reducing an index profile of the core of the multimode fiber below a standard parabolic index profile. This can be done by changing dopant concentrations in the fiber core over the radius of the fiber core. The result is a multimode fiber having differential mode delay characteristics that are intentionally not minimized. The index profile can be reduced below the standard parabolic index profile over the entire radius of the core, or only for radii above a specified radius.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is a continuation of U.S. patent application Ser. No. 12 / 627,752, filed Nov. 30, 2009 which claims priority to U.S. Provisional Application Ser. No. 61 / 118,903, filed on Dec. 1, 2008, the entirety of which is hereby incorporated by reference.FIELD OF THE INVENTION[0002]The present invention is generally directed to optical fibers for use in communications and more specifically directed to a multimode optical fiber having an improved index-of-refraction profile.BACKGROUND OF THE INVENTION[0003]In modern fiber optic communication systems, light signals are guided along cylindrical waveguides, which take the form of thin fibers. Optical fibers are comprised of an inner core region surrounded by an outer cladding region, where the optical density of the core, measured in terms of refractive index n1, is higher than the refractive index n2 of the cladding, FIG. 1. The refractive index of the optical media can be adjusted by int...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02B6/028
CPCG02B6/0288G02B6/02333G02B6/028
Inventor PIMPINELLA, RICHARD J.TUDURY, GASTON E.
Owner PANDUIT
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