Draka Comteq B.v.

Alcatel

Draka Comteq France

Pierre Sillard

Denis Molin

Louis-Anne De Montmorillon

Marianne Bigot-Astruc

Pascale Nouchi

Ludovic Fleury

Maxime Gorlier

Yves Lumineau

Simon Richard

Florent Beaumont

Marianne Bigot

Frans Gooijer

Franciscus Johannes Achten

Koen De Jongh

Pieter Matthijsse

David Boivin

Asghar Gholami

Pierre Sansonetti

Ivo Flammer

Emmanuel Petitfrere

Alain Bertaina

Bruno Dany

Lionel Expert

Bob J Overton

Alain Pastouret

Ralph Petrus Johannes Adrianus Van Lankveld

Jean-Baptiste Trinel

Jean-Florent Campion

Lionel Provost

Elise Regnier

Max Matau

Jean-Christophe Antona

Christine Labatut

Alain Giuliani

Maryna Kudinova

Pierre Rebreyend

Maxine Gorlier

Louis-Anne Montmorillon

Louis-Anne De Montmorrilon

Molin Denis

A method for manufacturing a preform for a multicore fiber, including stacking (S) a plurality of core rods and a plurality of silica-based filler rods in a tube; collapsing (S) the tube around the stack of core rods and silica-based filler rods, forming a collapsed stack; depositing (S) a layer of silica around the collapsed stack; removing (S) at least part of the deposited layer of silica. The preferential process for depositing a layer of silica around the collapsed stack and removing at least part of the deposited layer of silica is Advanced Plasma and Vapor Deposition.

Method for manufacturing a preform for a multi-core optical fiber and method for manufacturing multi-core optical fibers

The invention relates to an optical fibercomprising a coreand a claddingsurrounding the coreand having an outer diameter of 125 &#x3bc;m, the optical fibercomprising a cured primary coatingdirectly surrounding the claddingand a cured secondary coatingdirectly surrounding the cured primary coating, said cured primary coatinghaving a thickness tbetween 10 and 18 &#x3bc;m and an in-situ tensile modulus Emodbetween 0.10 and 0.18 MPa, said cured secondary coatinghaving a thickness tbetween 10 microns and 18 microns and an in-situ tensile modulus Emodbetween 700 and 1200 MPa, wherein said first and second thicknesses and said first and second in-situ tensile moduli satisfy the following equation:4%&#x3c;(modmod)/(modmod)&#x3c;50%.

Reduced diameter optical fiber and manufacturing method

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 bending-loss single mode optical fibre having a Mode Field Diameter at 1310 nm greater than or equal to 9 microns and having a core and a cladding, the core refractive index profile having a trapezoid-like shape. According to an aspect of the invention, the cladding comprises a shallow trench with a refractive index difference Ant between &#x2212;2&#xd7;10; and &#x2212;0.9&#xd7;10, and: the trapezoid ratio r/rof the core is between 0.1 and 0.6, preferably, between 0.2 and 0.5, more preferably between 0.25 and 0.45; the core surface integral Formula (I) is between 20.10 3 &#x3bc;m and 24.10&#x3bc;m and the cladding surface integral Formula (II) is between &#x2212;25&#xd7;10&#x3bc;m and &#x2212;9&#xd7;10&#x3bc;m, where &#x394;n(r) is the refractive-index difference with respect to said outer cladding as a function of the radius r, and said single mode optical fibre fulfils the following criterion: 25.7&#xd7;10&#x2264;V&#x2212;0.2326V&#x2264;26.8&#xd7;10.

Bending-loss insensitive single mode fibre, with a shallow trench, and corresponding optical system

A few-mode optical fiber including a core's refractive-index profile &#x394;n(r) of trapezoid-like shape. The optical core having a center part of radius Rand a transition part ranges from the radius Rto a radius R, such that R&#x3e;Rwith Rbetween 6.8 and 11.5 &#x3bc;m, said refractive-index profile being defined by a surface integral of the core index profile of between 180&#xd7;10and 270&#xd7;10&#x3bc;m; a transition slope S of between 1.7&#xd7;10and 12&#xd7;10&#x3bc;m; with &#x394;nand &#x394;nthe refractive-index difference respectively of the center part of the optical core and of the cladding part adjacent to the optical core, with respect to the outer optical cladding.

Weakly-coupled few mode optical fibers for mode division multiplexing and corresponding optical transmission system

A few mode optical fiber that includes an optical core and an optical cladding surrounding the optical core. The FMF has a step-index profile. The optical core has a core outer radius R&#x2265;7.5 &#x3bc;m and a core refractive index difference &#x394;nsuch that 14.5&#xd7;10&#x3c;&#x394;n&#x3c;24&#xd7;10. The optical cladding comprises:

Weakly coupled few-mode fibers for space-division multiplexing

The invention relates to an optical fibercomprising a coreand a claddingsurrounding the coreand having an outer diameter of 125 &#x3bc;m, the optical fibercomprising a cured primary coatingdirectly surrounding the claddingand a cured secondary coatingdirectly surrounding the cured primary coating, said cured primary coatinghaving a thickness tbetween 10 and 18 &#x3bc;m and an in-situ tensile modulus Emodbetween 0.10 and 0.18 MPa, said cured secondary coatinghaving a thickness tlower or equal to 18 &#x3bc;m and an in-situ tensile modulus Emodbetween 700 and 1200 MPa, wherein said first and second thicknesses and said first and second in-situ tensile moduli satisfy the following equation: 4%&#x3c;(t&#xd7;t&#xd7;Emod&#xd7;Emod)/(t&#xd7;t&#xd7;Emod&#xd7;Emod)&#x3c;50%.

A multimode optical fiber () comprises an a-profile graded index core, a trench () surrounding the core () and an intermediate cladding () between the core and the trench. Such a multimode optical fiber () has: &#x2014;A mode carrying capacity between 54 and 68 LP modes at 1060 nm, defined by a specific relationship between the numerical aperture of the core and the core radius, &#x2014;A defined relationship between trench, core and intermediate cladding parameters to achieve a high bandwidth and low bend-loss at 1060 nm, and&#x2014;A core radius between 24 and 26 &#x3bc;m, a numerical aperture between 0.190 and 0.225 and a value of a between 2.01 and 2.05 to retain compatibility with legacy fibers.

Multimode optical fiber optimized to operate around 1060 nm, and corresponding multimode optical system

An optical fiber having 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, &#x3b1; being a non-dimensional parameter that defines the index profile shape of the optical core, and the optical core having a maximal refractive index nat its center; the optical cladding has at its outer edge a refractive index n, and comprises a region of depressed refractive index n, called a trench, with a negative refractive index difference &#x394;n=n&#x2212;nwith respect to said optical cladding, the trench having an outer radius R. The optical core and cladding are configured to support propagation of at least six spatial modes and at maximum fifty-five spatial modes at an operating wavelength &#x3bb;between, and including, 1460 nm and 1675 nm, and the optical core satisfies an ovality criterion between 0.05 and 0.3, when said ovality criterion is measured at a circumference of equal index nwithin said core, such that &#x394;n&#x2212;n&#x2212;nis less than 75% of &#x394;n=n&#x2212;n, said ovality criterion o being defined by the following equation: where a is a length of a semi-major axis of said circumference and b is a length of a semi-minor axis of said circumference.

Coupled few mode fibers, and corresponding optical link and optical system

The invention relates to a method for qualifying the actual effective modal bandwidth of a multimode optical fiber over a predetermined wavelength range, comprising the steps of: carrying out () a Dispersion Modal Delay (DMD) measurement of the multimode optical fiber at a single wavelength to obtain an actual DMD plot; generating () at least two distinct modified DMD plots from the actual DMD plot, each modified DMD plot being generated by applying to the recorded traces a temporal delay &#x394;t that increases in absolute values with the radial offset value r, each modified DMD plot being associated with a predetermined bandwidth threshold (S1; S2); for each modified DMD plot, computing () an effective modal bandwidth as a function of said modified DMD plot and comparing () the computed effective modal bandwidth (EMBc; EMBc) with the bandwidth threshold value to which the modified DMD plot is associated; () qualifying the actual effective modal bandwidth as a function of results from the comparing step.

Method for qualifying the effective modal bandwidth of a multimode fiber over a wide wavelength range from a single wavelength DMD measurement and method for selecting a high effective modal bandwidth multimode fiber from a batch of multimode fibers

A method for selecting wide-band multimode optical fibers from a single wavelength, the method comprising the following steps of, for each multimode optical fiber obtaining a first DMD plot using a measurement of DMD carried out at a first single wavelength, obtaining from the first DMD plot, a first multimode fiber specification parameter; and for each fiber: obtaining from the first DMD plot, a curve representative of a radial offset delay, called ROD curve, as a function of the radial offset value; applying a linear fit on the ROD curve for at least two radial offset value ranges; obtaining from the linear fit and for each radial offset value range, an average radial offset delay slope, called ROD slope; selecting the multimode optical fibers meeting a first predetermined specification criterion for the first multimode fiber performance parameter, and for which the at least two computed ROD slopes meet a predetermined slope criterion.

Method for selecting wide-band multimode fibers from a single wavelength characterization

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

A method of qualifying an effective bandwidth of a multimode optical fiber at a first wavelength &#x3bb;, using DMD data of the fiber measured a second wavelength &#x3bb;. Data representative of a Radial Offset Delay, a Radial Offset Bandwidth and a Relative Radial Coupled Power of the fiber are derived from the DMD data at the second wavelength &#x3bb;. A transformation is performed on the ROD data and ROB data at the second wavelength &#x3bb;to obtain corresponding ROD data and ROB data at the first wavelength &#x3bb;. An effective bandwidth of the fiber at the second wavelength &#x3bb;is computed using the ROD data and the ROB data at the first wavelength &#x3bb;and the {tilde over (P)}data at the second wavelength &#x3bb;.

Method of qualifying wide-band multimode fiber from single wavelength characterization using EMB extrapolation, corresponding system and computer program

Few mode optical fibers for mode division multiplexing. The Few Mode Fiber supporting 25 or 30 LP guided modes and includes a graded index core with a &#x3b1;-profile, a radius R(at 0 refractive index difference) between 21.5 and 27 &#x3bc;m and a maximum refractive index difference Dnbetween 12.5&#xd7;10and 20&#xd7;10, and an end of the &#x3b1;-profile at a radius R, with index difference Dn; a trench surrounding the core with radius Rbetween 30 and 42 &#x3bc;m and refractive index difference Dnbetween &#x2212;15.10and &#x2212;6.10, an intermediate depressed trench with a radius R, with R&#x3c;R&#x3c;Rand a refractive index difference Dn, with Dn&#x3c;Dn&#x3c;0, wherein: for |Dn&#x2212;Dn|&#x3e;=0.5&#xd7;10&#x2212;3, Min(Dn, Dn)&#x2264;&#x2212;1.5&#xd7;10&#x2212;3, and for |Dn&#x2212;Dn|&#x3c;0.5&#xd7;10&#x2212;3, Dnis between &#x2212;5&#xd7;10&#x2212;3 and &#x2212;3.5&#xd7;10&#x2212;3.

Few mode optical fibers for mode division multiplexing having intermediate trenches

Few mode optical fibers for mode division multiplexing. The Few Mode Fiber supporting 25 or 30 LP guided modes and includes a graded index core with a &#x3b1;-profile, a radius R(at 0 refractive index difference) between 23 and 27 &#x3bc;m and a maximum refractive index difference Dnbetween 14&#xb7;10and 17&#xb7;10, and an end of the &#x3b1;-profile at a radius R, with index difference Dn; a trench surrounding the core with radius Rbetween 30 and 40 &#x3bc;m and refractive index difference Dnbetween &#x2212;15&#xb7;10and &#x2212;6&#xb7;10. Such a FMF shows a specific design of the interface between the core and the cladding such that R&#x3e;R, Dnbetween &#x2212;10&#xb7;10and &#x2212;3&#xb7;10, and Dn&#x2212;Dn&#x2265;0.9&#xd7;10.

Growing community of inventors

Le Chesnay, France

Pierre Sillard