Draka Comteq B.v.

Marianne Bigot-Astruc

Pierre Sillard

Denis Molin

Louis-Anne De Montmorillon

Simon Richard

Frans Gooijer

Franciscus Johannes Achten

Pascale Nouchi

Yves Lumineau

Pieter Matthijsse

David Boivin

Koen De Jongh

Ivo Flammer

Emmanuel Petitfrere

Bob J Overton

Gertjan Krabshuis

Elise Regnier

Gilles Melin

Gerard Kuyt

Adrian Amezcua-Correa

Stephanus Gerardus Fransiscus Geerings

Louis-Anne Montmorillon

The invention concerns a method for characterizing mode group properties of multimodal light traveling through an optical component, comprising: The Mode Group Separating optical fiber is a multimode fiber with an &#x3b1;-profile graded index core with an &#x3b1;-value chosen such that said fiber satisfies the following criterion at the wavelength &#x3bb;: where:

Method for characterizing mode group properties of multimodal light traveling through optical components

The invention concerns a method for characterizing mode group properties of multimodal light traveling through an optical component, comprising: where:

The invention relates to an optical link comprising N optical fibers, with N&#x2265;2. Each optical fiber comprises an optical core and an optical cladding surrounding the optical core, the optical core having a single &#x3b1;graded-index profile with &#x3b1;&#x2265;1, and the optical core having a radius R, where i E [1; N] is an index designating said optical fiber. Said optical cladding comprises a region of depressed refractive index n, called a trench, surrounding the optical core. According to embodiments of the invention, for all optical fibers in said link, said optical core radius Rand said length Lare chosen such that R&#x2265;13.5 &#x3bc;m and so as to satisfy a criterion C of quality. Thus, the invention provides a few-mode optical fiber link, which allow guiding an increased number of LP modes as compared to prior art FMF links, while reaching low Differential Mode Group Delay.

Few mode optical fiber links for space division multiplexing having trenched fibers with high leak losses for leaky modes and low bend losses

The invention concerns a method of characterizing a multimode optical fiber link comprising a light source and a multimode fiber, which comprises: a step () of characterizing the multimode fiber using a measurement of the Dispersion Modal Delay (DMD) and delivering fiber characteristic data; a step () of characterizing the light source by at least three source characteristic curves showing three parameters of the source as a function of a fiber radius r and obtained by a technique similar to the DMD measurement; a step () of computing an Effective Bandwidth (EB) of the link, comprising calculating () a transfer function using both the fiber characteristic data and each of said source characteristic curves.

Method of characterizing a multimode optical fiber link and corresponding methods of fabricating multimode optical fiber links and of selecting multimode optical fibers from a batch of multimode optical fibers

A multimode optical fiber includes a central core surrounded by an outer cladding. The central core has a graded-index profile with respect to the outer cladding and an outer radius rof between about 30 microns and 50 microns (e.g., between about 35 microns and 45 microns). The optical fiber also includes an inner cladding positioned between the central core and the outer cladding, and a depressed trench positioned between the inner cladding and the outer cladding. The multimode optical fiber exhibits reduced bending losses.

Bend-resistant multimode optical fiber

The invention relates to an optical fiber comprising an optical core and an optical cladding surrounding the optical core, the optical core having a single &#x3b1; graded-index profile with &#x3b1;&#x2267;1, and the optical core having a radius R1 and a maximal refractive index n, said optical cladding having a refractive index n. Said optical cladding comprises a region of depressed refractive index n, having an inner radius R, with R&#x2267;R, and an outer radius R3, with R3&#x3e;R2. According to embodiments of the invention, the &#x3b1;-value of said graded index profile and the optical core radius Rare chosen such that R&#x2267;13.5 &#x3bc;m and so as to satisfy a criterion C of quality. Thus, the invention provides a few-mode optical fiber, which allow guiding an increased number of LP modes as compared to prior art FMFs, while reaching the lowest Differential Mode Group Delay. The system reach is thus increased over prior art.

Few mode optical fibers for space division multiplexing

A multimode optical fiber is provides, which includes an optical core and an optical cladding surrounding the optical core. The optical core has a refractive graded-index profile. The optical cladding includes: an inner layer surrounding the optical core, an intermediate layer, called a 'depressed trench', surrounding the inner layer, and an outer layer surrounding the depressed trench and having a constant refractive index. The depressed trench has a width W and a negative refractive index difference &#x394;nwith respect to the outer layer, and is designed so as to satisfy the following inequality:|0.585677&#x2212;114.681&#xd7;+13.7287&#xd7;+18.7343&#xd7;&#x2212;4.61112&#xd7;0.1&#x2212;0.913789&#xd7;0.1|+2&#xd7;0.1&#x3c;&#x2212;30wherein: S is the width of the inner cladding, which is included between 0.6 &#x3bc;m and 1.6 &#x3bc;m; &#x394;nis included between &#x2212;11.10and &#x2212;4.10; and W&#xd7;&#x394;n0.1is lower than &#x2212;25 &#x3bc;m.

Bend-insensitive multimode optical fiber with reduced impact of leaky modes

A multimode optical fiber includes a central core and an outer cladding (e.g., an outer optical cladding). Typically, the optical fiber's central core is a depressed, central core having an alpha-index profile (i.e., a graded-index profile), an outer radius r, and a maximum refractive index difference &#x394;nwith respect to the outer cladding. The central core's alpha-index profile has a minimum refractive index at the central core's outer radius rthat corresponds to a refractive index difference &#x394;nwith respect to the outer cladding. Exemplary optical-fiber embodiments may include an inner cladding having an outer radius rand a width w. Exemplary optical-fiber embodiments may include a buried trench having a width wand an outer radius r. Furthermore, exemplary optical-fiber embodiments may include an intermediate cladding having an outer radius rand a width w.

High-bandwidth, radiation-resistant multimode optical fiber

A method of assessing the power penalty at a given bit error rate of a multimode fiber including measuring a set of elementary fiber responses corresponding to different offset launches of light over the core radius into the multimode fiber, generating a global fiber response by applying, to the set of elementary fiber responses, a set of weighting coefficients and delays depending on the different offset launches of the elementary fiber responses, and computing a parameter representative of a fiber power penalty from the global fiber response, wherein the set of weighting coefficients includes several subsets of weighting coefficients time delayed relative to one another, wherein at least one relative time delay is not set to zero, and wherein weighting coefficients of each subset depend on the different offset launches of the elementary fiber responses.

Method of computing an effective bandwidth of a multimode fiber

A trench-assisted, multimode optical fiber includes a central core having an alpha refractive index profile with respect to an outer cladding. The optical fiber also includes an inner cladding, a depressed trench, and an outer cladding. The optical fiber achieves reduced bending losses and a high bandwidth.

Trench-assisted multimode optical fiber

A depressed graded-index multimode optical fiber includes a central core, an inner depressed cladding, a depressed trench, an outer depressed cladding, and an outer cladding. The central core has an alpha-index profile. The depressed claddings limit the impact of leaky modes on optical-fiber performance characteristics (e.g., bandwidth, core size, and/or numerical aperture).

Multimode optical fiber

A single-mode optical fiber includes a central core, an intermediate cladding, a buried trench, and optical cladding. The central core has an outer radius rand a refractive index difference &#x394;nrelative to the optical cladding. The intermediate cladding has an outer radius rand a refractive index difference &#x394;nrelative to the optical cladding. The buried trench has an outer radius rand a refractive index difference &#x394;nrelative to the optical cladding. The optical fiber typically has an effective area of about 150 &#x3bc;mor greater at a wavelength of 1550 nanometers and exhibits low bending losses.

Single-mode optical fiber

An optical transmission fiber comprises a central core having an index difference &#x394;nwith an outer optical cladding; a first inner cladding having an index difference &#x394;nwith the outer cladding; and a second buried inner cladding having an index difference &#x394;nwith the outer cladding of less than &#x2212;3&#xb7;10. The second buried inner cladding moreover contains Germanium in a weight concentration of between 0.5% and 7%. The fiber shows reduced bending and microbending losses while exhibiting the optical performances of a standard single-mode fiber (SSMF).

Single mode optical fiber

A single-mode optical fiber includes a central core surrounded by an outer cladding. The optical fiber includes at least first and second depressed claddings positioned between the central core and the outer cladding. The central core typically has a radius of between about 3.5 microns and 5.5 microns and a refractive-index difference with the outer cladding of between about &#x2212;1&#xd7;10and 3&#xd7;10. The first depressed cladding typically has an outer radius of between about 9 microns and 15 microns and a refractive-index difference with the outer cladding of between about &#x2212;5.5&#xd7;10and &#x2212;2.5&#xd7;10. The second depressed cladding typically has an outer radius of between about 38 microns and 42 microns and a refractive-index difference with the first depressed cladding of between about &#x2212;0.5&#xd7;10and 0.5&#xd7;10.

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Marcoussis, France

Marianne Bigot-Astruc