Crystal Fibre A/s

Jacob Riis Folkenberg

Jes Broeng

Guillaume Vienne

Anders Overgaard Bjarklev

Stig Eigil Barkou Libori

Peter M W Skovgaard

Niels Asger Mortensen

Christian Jakobsen

Martin Dybendal Nielsen

Kim Per Hansen

An article comprising an optical fiber, the fiber comprising at least one core surrounded by a first outer cladding region, the first outer cladding region being surrounded by a second outer cladding region, the first outer cladding region in the cross-section comprising a number of first outer cladding features having a lower refractive index than any material surrounding the first outer cladding features, wherein for a plurality of said first outer cladding features, the minimum distance between two nearest neighboring first outer cladding features is smaller than 1.0 &#x3bc;m or smaller than an optical wavelength of light guided through the fiber when in use; a method of its production, and use thereof.

Optical fibre with high numerical aperture, method of its production, and use thereof

An optical fiber having an axial direction and a cross section perpendicular to the axial direction, the optical fiber having a first light guiding fiber portion with a cladding region with a plurality of spaced apart cladding voids extending longitudinally in the fiber axial direction and a core region bounded by the cladding region, and a solid light transparent fiber portion having a first end facing the first light guiding fiber portion and a second end forming an end face of the optical fiber. The solid light transparent fiber portion provides a hermetic sealing of the cladding voids of the first light guiding fiber portion. A method of producing such an optical fiber and its use, such as an optical fiber connector and an article having a microstructured optical fiber with hermetically sealed end face, are also included.

Hermetically sealed optical fibre with voids or holes, method of its production, and its use

A photonic crystal fiber includes a core region for propagating light in a longitudinal direction of the fiber, a cladding region surrounding the core region, the cladding region including micro-structural elements extending in the longitudinal direction. The cladding region further includes at least one stress element having a coefficient of thermal expansion &#x3b1;and extending in the longitudinal direction of the photonic crystal fiber, the stress element(s) being located in a cladding background material having a coefficient of thermal expansion &#x3b1;different from &#x3b1;. The location of the at least one stress element relative to the core region and the micro-structural elements and the coefficients of thermal expansion &#x3b1;and &#x3b1;are adapted to provide a stress induced birefringence in the core region of the photonic crystal fiber. An article includes a photonic crystal fiber, a method of manufacturing and the use of a photonic crystal fiber are furthermore provided.

Photonic crystal fibres comprising stress elements

An optical fiber having a longitudinal direction and a cross-section perpendicular thereto, said fiber in a cross-section comprising: (a) a core region () having a refractive index profile with a highest refractive index n, and (b) a cladding region comprising cladding features () having a center-to-center spacing, &#x39b;, and a diameter, d, of around 0.4&#x39b; or larger, wherein n, &#x39b; and d are adapted such that the fiber exhibits zero dispersion wavelength of a fundamental mode in the wavelength range from 1530 nm to 1640 nm; a method of producing such a fiber; and use of such an optical fiber in e.g. an optical communication system, in an optical fiber laser, in an optical fiber amplifier, in an optical fiber Raman amplifier, in a dispersion compensator, in a dispersion and/or dispersion slope compensator.

Nonlinear optical fibre method of its production and use thereof

A microstructured optical fibre comprising an inner cladding and an outer cladding; said outer cladding comprising elongated outer cladding features extending in an axial direction of the fibre, and at least one cladding recess extending at least partly through the outer cladding in a radial direction to the inner cladding; said cladding recess providing optical access to the inner cladding; a method of forming a cladding recess in such an optical fibre comprising a step of collapsing a part of the outer cladding features by use of a heat source; an apparatus comprising such a microstructured optical fibre, preferably a laser or an amplifier.

Microstructured optical fibre with cladding recess, a method of its production, and apparatus comprising same

An optical fiber for transmitting light, said optical fiber having an axial direction and a cross section perpendicular to said axial direction, said optical fiber comprising: (1) a first core region comprising a first core material having a refractive index N; (2) a microstructured first cladding region surrounding the first core region, said first cladding region comprising a first cladding material and a plurality of spaced apart first cladding features or elements that are elongated in the fiber axial direction and disposed in the first cladding material, said first cladding material having a refractive index Nand each said first cladding feature or element having a refractive index being lower than N, whereby a resultant geometrical index Nge,cl, 1? of the first cladding region is lowered compared to N; (3) a second core region surrounding said first cladding region, said second core region comprising a second core material having a refractive index N, and (4) a second cladding region surrounding the second core region, said second cladding region comprising a second cladding material having a refractive index N, wherein the first core material, the first cladding material and the first cladding features, the second core material, and the second cladding material are selected and arranged so that N&#x3e;N, N&#x3e;N, and N&#x3e;N.

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Kokkedal, Denmark

Jacob Riis Folkenberg