Crystal Fibre A/s

Nkt Photonics A/s

Nkt Research & Innovation A/s

Crystal Fibre A/c

Brian Joseph Mangan

Jonathan Cave Knight

Timothy Adam Birks

Philip St John Russell

Lance W Farr

Hendrik Sabert

David Philip Williams

William Wadsworth

John Roberts

Philip S Russell

Ian Patrick Kilbride

Phillip St John Russell

A method of manufacturing a microstructured fiber, includes: providing a preform having a plurality of elongate holes; mating at least one, but not all, of the holes with a connector to connect the hole(s) to an external pressure-controller; drawing the preform into the fiber while controlling gas pressure in the hole(s) connected to the pressure-controller.

Method of drawing microstructured glass optical fibers from a preform, and a preform combined with a connector

An optical fiber having a cladding region surrounding a core region having an elongate core hole, the inner or outer surface of the core hole having a surface roughness with a spatial period equal to or less than 5 &#x3bc;m by a spectral power below 0.0017 nm&#x3bc;m. A method of making an optical fiber including a cladding region having an arrangement of elongate cladding holes in a matrix material, surrounding an elongate core region having an elongate core hole, the method including the step of increasing the surface tension of the matrix material prior to or during the step of heating and drawing the fiber.

Hollow-core optical fiber and method of making same

Novel preforms and methods of making novel preforms are described. The preforms are suitable for being drawn into photonic bandgap optical fibres. In one form, the preform comprises a stack of elongate members having, in transverse cross section, a triangular close-packed arrangement of circular cross section capillaries, which define interstitial regions containing solid rods. The stack is supported around a relatively large capillary, which defines an inner region of the stack. The stack may be adapted by varying the number of rods in any given interstitial region, in order to generate various different configurations of cladding structure, which can be made into optical fibres having surprising operational characteristics, such as a split gap.

Enhanced optical waveguide

A photonic optical fiber and method of making the optical fiber. The method includes assembling a plurality of elongate elements to define an elongate void; forming within the void a material contacting at least some of the elements while maintaining the elongate void; and drawing a preform, including the assembly of elongate elements, into an optical fiber.

Optical fiber and method for making an optical fiber

A holey optical fibre for supporting propagation of light of a wavelength &#x3bb;,comprises a plurality of cylinders () each having a longitudinal axis, the cylinders () being separated from each other by regions of a matrix material () and having their longitudinal axes substantially parallel to each other. Each cylinder () has a diameter, in the plane perpendicular to the longitudinal axis, that is small enough for the composite material of the ensemble of cylinders and matrix material to be substantially optically homogenous in respect of light of wavelength &#x3bb;.

Preform holey optical fibre, a holey optical fibre, and a method for their production

A method of joining a first optical fiber () to a second optical fiber () comprises the steps of: (i) providing a preform element () comprising material defining a primary elongate cavity (); (ii) inserting the first optical fiber () into the primary cavity () to form a preform (); and (iii) drawing the second optical fiber () from the preform (); wherein, the second optical fiber () includes a core region comprising material that has been drawn from the first optical fiber ().

Method and apparatus relating to optical fibers

A photonic crystal fiber comprising a bulk material having an arrangement of longitudinal holes, the fiber including a cladding region and a guiding core (), the cladding region having an effective-refractive-index which varies across the fiber's cross section, wherein, in use, the effective-refractive-index variation causes light propagating in the fiber to have a different transverse profile from the profile that it would have if the cladding region were of a substantially uniform effective refractive index.

Photonic crystal fibers

This invention relates to an optical fibre that comprises a core () of lower refractive index that is surrounded by a cladding which includes regions of a higher refractive index and is substantially periodic, where the core () has a longest transverse dimension that is longer than a single, shortest period of the cladding. In a fibre of this type light is substantially confined to the core area by virtue of the photonic band gap of the cladding material. The invention also relates to a method of manufacturing such an optical fibre, comprising the steps of forming a stack of canes (), the stack () including at least one truncated cane () that defines an aperture (), and then drawing the stack () into a fibre having an elongate cavity. The fibre is suitable for high power uses, but is equally suitable for other areas, e.g. optical amplifiers, spectral filters, lasers, gas sensors and telecommunications networks.

Photonic crystal fibre and a method for its production

A photonic crystal fiber comprising: a core () having a refractive index; and a cladding region () at least substantially surrounding the core () and comprising a bulk material having a second refractive index that is higher that the first refractive index, the bulk material containing an arrangement of elongate, longitudinal holes that comprise hole material of a third refractive index that is lower than the first refractive index; such that an electromagnetic mode guided in the core () has an evanescent wave that becomes more closely confined to the vicinity of the core () as the wavelength of the electromagnetic mode is increased over a first range of wavelengths.

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Bath, United Kingdom

Brian Joseph Mangan