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Multimode optical fiber with high bandwidth over an extended wavelength range, and corresponding multimode optical system

A multi-mode fiber and wavelength technology, applied in the direction of graded index fiber core/cladding fiber, optics, cladding fiber, etc., can solve problems that are difficult to consider

Active Publication Date: 2016-10-26
DRAKA COMTEQ BV
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Problems solved by technology

Furthermore, in the presence of a fluorine-doped outer cladding, it becomes more difficult to consider the "trench assist" concept requiring further F-doping of the cladding

Method used

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  • Multimode optical fiber with high bandwidth over an extended wavelength range, and corresponding multimode optical system
  • Multimode optical fiber with high bandwidth over an extended wavelength range, and corresponding multimode optical system
  • Multimode optical fiber with high bandwidth over an extended wavelength range, and corresponding multimode optical system

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Embodiment Construction

[0080] In this document, the term operating window designates the range of wavelengths over which a multimode fiber exhibits a bandwidth greater than the value defined in the OM4 specification. Depending on the source used, the following examples consider a calculated effective modal bandwidth EMBc greater than 4700 MHz.km or an overfilled injection bandwidth OFL-BW greater than 3500 MHz.km. Regardless of the wavelength used (same weighting function), the method defined in the FOTP-220 standard and the IEC60793-1-49 standard is used to calculate the The effective modal bandwidth EMBc is calculated.

[0081] A multimode optical fiber according to an embodiment of the present invention includes a central core surrounded by an outer optical cladding. The central core has (i) an outer radius a, (ii) a transition radius r less than the outer radius a t , (iii) maximum refractive index n 0 , (iv) Minimum refractive index n Cl and (v) the graded index profile n(r) as a function o...

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Abstract

A mold recycling method has: a step (a) for preparing a mold (100u) having a mechanically-mirror-finished aluminum substrate (12), an inorganic material layer (16) formed on the surface of the aluminum substrate (12), and an aluminum residue layer (18r) formed on the inorganic material layer (16) and a porous alumina layer (14) formed on the aluminum residue layer (18r), the porous alumina layer being formed by anodizing the surface of an aluminum film (18), and the aluminum residue layer remaining unanodized within the aluminum film (18); a step (b) for forming an anodized alumina layer (18a) by anodizing substantially all of the aluminum residue layer (18r) in the mold (100u); and a step (c) for etching the anodized alumina layer (18a) after step (b).

Description

technical field [0001] The present invention relates to the field of optical fiber transmission, and more particularly to multimode optical fibers used in relatively long distance and high bit rate systems. More specifically, the present invention relates to multimode optical fibers designed to achieve the high bit rate requirements of next generation 400GbE systems. Background technique [0002] Multimode fiber is used successfully in high speed data networks along with high speed sources, typically using transversely multimode Vertical Cavity Surface Emitting Lasers (more simply VCSELs). Multimode fibers operating at 850nm and 1300nm are well known. [0003] Multimode fibers suffer from intermodal dispersion due to the fact that in multimode fibers, for a particular wavelength, multiple light modes propagate along the fiber simultaneously carrying the same information, but travel at different propagation velocities . Modal dispersion is expressed in terms of Differentia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/028
CPCG02B6/0288G02B6/03627G02B6/0365
Inventor M·比戈D·莫林P·斯拉德
Owner DRAKA COMTEQ BV
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