Amplifying optical fibre and production method

A production method and optical fiber technology, applied in cladding optical fiber, optics, lasers, etc., can solve the problems of reducing optical fiber core photo-darkening, not ensuring high concentration of rare earth ions, etc., maximizing amplification efficiency and avoiding photo-darkening The effect of the phenomenon

Inactive Publication Date: 2010-06-30
DRAKA COMTEQ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the nanoparticle characteristics (design, composition, size, concentration) and doping characteristics described in these documents do not ensure that high concentrations of rare earth ions reduce or eliminate photodarkening in the fiber core.

Method used

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  • Amplifying optical fibre and production method
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  • Amplifying optical fibre and production method

Examples

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example 1

[0051] Example 1: Production of optical fibers for pulsed lasers

[0052] The chemical synthesis of nanoparticles of ytterbium doped alumina was performed. The size of the nanoparticles is about 5nm. Precursors of alumina and ytterbium salts co-precipitate in aqueous solution at controlled pH (final pH 4). The molar ratio of the precursors of alumina salt and ytterbium salt is about 20 in order to ensure good dispersion of ytterbium ions in the alumina matrix. It is thus possible to guarantee a minimum distance between the two ytterbium ions in each nanoparticle so as not to form clusters.

[0053] Take about 8·10 17 NPs / cm 3 Aqueous solutions of these nanoparticles were prepared. This solution was then used to impregnate the porous silica rod core by MCVD operation. A heat treatment at a temperature above 1000° C. is applied for at least 1 hour before the clearing step of the core in order to strengthen the nanoparticle structure in the core. The primary preform is t...

example 2

[0055] Example 2: Production of optical fibers for compact amplifiers

[0056] A chemical synthesis of nanoparticles of erbium-doped alumina was performed. The size of the nanoparticles is about 10 nm. Precursors of alumina and erbium salts were co-precipitated in aqueous solution at controlled pH (final pH 9). The molar ratio of the precursors of alumina salt and erbium salt is about 200 in order to ensure good dispersion of erbium ions in the alumina matrix and a high concentration of aluminum close to each erbium ion to broaden the Er gain band. A minimum distance between two erbium ions can be guaranteed in each nanoparticle to avoid cluster formation.

[0057] Take about 2·10 17 NPs / cm 3 Aqueous solutions of these nanoparticles were prepared. This solution was then used to impregnate the porous silica rod core by MCVD operation. Before the clearing stage of the core, a heat treatment at a temperature above 1000° C. is applied for at least 1 hour in order to streng...

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Abstract

The fiber (150) has a central core (10) for transmitting and amplifying a visible signal. An optical sheath (11) surrounds the core and confines an optical signal transmitted to the core. The core is formed of a main matrix and contains nanoparticles (5) doped with a rare earth element. Concentration in weight of the element in each nanoparticle is comprised between 1 and 20 percent. Concentration of the nanoparticles in the matrix is comprised between 0.05 and 1 percent in volume. The matrix is made of alumina, silica and phosphorus. The element is one among erbium, ytterbium or thulium.

Description

technical field [0001] The present invention relates to the field of optical fibers, and in particular to an amplifying optical fiber suitable for amplifying transmitted optical signals. Amplifying fibers can be used in particular as high-speed transmission line amplifiers or lasers. The invention also relates to a method for producing such an optical fiber. Background technique [0002] Amplifying fibers and in particular fibers doped with rare earth elements are commonly used in many optical applications. [0003] For example, erbium doping is used in long-distance optical telecommunications systems to amplify transmitted optical signals. Such fibers are used in EDFAs or "erbium-doped fiber amplifiers" and have a central core composed of a silica matrix that includes a doping element such as erbium ) and optionally combined with complementary doping elements that make it possible to increase the amplification, such as eg alumina for widening the gain bandwidth for WDM (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02H01S3/067G02F1/39
CPCH01S3/06716H01S3/1695H01S3/176H01S3/169H01S3/1691H01S3/1603
Inventor A·帕斯托雷特C·康奈特E·布罗维
Owner DRAKA COMTEQ BV
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