A disclosed multimode optical fiber comprises a core and a cladding surrounding the core. The core has an outer radius r.sub.1 in between 20 μm and 30 μm. The cladding includes a first outer cladding region having an outer radius r.sub.4a and a second outer cladding region having an outer radius r.sub.4b less than or equal to 45 μm. The second outer cladding region comprises silica-based glass doped with titania. The optical fiber further includes a primary coating with an outer radius r.sub.5 less than or equal to 80 μm, and a thickness (r.sub.5−r.sub.4) less than or equal to 30 μm. The optical fiber further includes a secondary coating with an outer radius r.sub.6 less than or equal to 100 μm. The secondary coating has a thickness (r.sub.6−r.sub.5) less than or equal to 30 μm, and a normalized puncture load greater than 3.6×10.sup.−3 g/micron.sup.2.

The present disclosure relates to a glass cloth, prepreg, and printed circuit board.

There is provided a glass cloth including woven glass yarns each containing a plurality of filaments, wherein a bulk dissipation factor of a glass in the glass yarns is 0.0010 or less, a tensile strength of warp yarns per thickness of the glass cloth as represented by the following formula (A) is in the range of 0.50 to 6.0:

warp direction tensile strength (N/25 mm) of the glass cloth/thickness of the glass cloth (m)(A) a coefficient of variation of the warp direction tensile strength of the glass cloth is in the range of 15% or less, and a dissipation factor of the glass cloth at 10 GHz is in the range of greater than 0 and 0.0010 or less.

Provided is an optical fiber glass preform in which a starting rod and a dummy glass are hardly separated from each other, and a method for manufacturing the glass preform. In the optical fiber glass preform, the dummy glass is fitted into one end of the starting rod, and a part of the dummy glass and the starting rod are surrounded by a clad glass. In the manufacturing method, at the time of connecting the starting rod and the dummy glass, a shape is adjusted in such a manner that an iron is brought into contact with a connection portion and is moved from a starting rod side toward a dummy glass side with appliance of a load.

A glass composition for glass fiber includes SiO.sub.2 in the range of 52.0% by mass or more and 56.0% by mass or less; B.sub.2O.sub.3 in the range of 21.0% by mass or more and 24.5% by mass or less; Al.sub.2O.sub.3 in the range of 9.5% by mass or more and 13.0% by mass or less; MgO in the range of 0% by mass or more and less than 1.0% by mass; CaO in the range of 0.5% by mass or more and 5.5% by mass or less; SrO in the range of 0.5% by mass or more and 6.0% by mass or less; and TiO.sub.2 in the range of 0.1% by mass or more and 3.0% by mass or less; and includes F.sub.2 and Cl.sub.2 in the range of 0.1% by mass or more and 2.0% by mass or less in total, with respect to the total amount.

A Photonic Crystal Fiber (PCF) a method of its production and a supercontinuum light source comprising such PCF. The PCF has a longitudinal axis and includes a core extending along the length of said longitudinal axis and a cladding region surrounding the core. At least the cladding region includes a plurality of microstructures in the form of inclusions extending along the longitudinal axis of the PCF in at least a microstructured length section. In at least a degradation resistant length section of the microstructured length section the PCF includes hydrogen and/or deuterium. In at least the degradation resistant length section the PCF further includes a main coating surrounding the cladding region, which main coating is hermetic for the hydrogen and/or deuterium at a temperature below T.sub.h, wherein Th is at least about 50° C., preferably 50° C.<Th.sub.h<250° C.

The invention relates to an optical fiber having an axial direction and a cross section perpendicular to said axial direction, and a method and preform for producing such an optical fiber. The optical fiber is adapted to guide light at a wavelength λ, and comprises a core region, an inner cladding region surrounding said core region, and at least one of a first type of feature comprising a void and a surrounding first silica material. The core, the inner cladding region and the first type of feature extends along said axial direction over at least a part of the length of the optical fiber. The first silica material has a first chlorine concentration of about 300 ppm or less.

A Photonic Crystal Fiber (PCF) a method of its production and a supercontinuum light source comprising such PCF. The PCF has a longitudinal axis and includes a core extending along the length of said longitudinal axis and a cladding region surrounding the core. At least the cladding region includes a plurality of microstructures in the form of inclusions extending along the longitudinal axis of the PCF in at least a microstructured length section. In at least a degradation resistant length section of the microstructured length section the PCF includes hydrogen and/or deuterium. In at least the degradation resistant length section the PCF further includes a main coating surrounding the cladding region, which main coating is hermetic for the hydrogen and/or deuterium at a temperature below T.sub.h, wherein T.sub.h is at least about 50° C., preferably 50° C.<T.sub.h<250° C.

The present disclosure relates to an optical fiber article and a method for the production of the optical fiber article. The present disclosure in particular relates to the use of the optical fiber article in a fiber bundle as light guide and/or image guide, for example in an endoscope.

A fiberglass filter element includes: 6 to 12 wt % of zinc oxide-based composite photocatalytic nanoparticles; 3 to 9 wt % of an adhesive system; and 79 to 91 wt % of a superfine fiberglass cotton. The zinc oxide-based composite photocatalytic nanoparticles includes: a rod-like or flower-like zinc oxide photocatalytic nanoparticle (A); a photocatalytic nanoparticle (B), which is one or more selected from graphene, graphene oxide, reduced graphene oxide and graphene quantum dots; a photocatalytic nanoparticle (C), which is one or more selected from a silver nanoparticle and a silver nanowire; and a photocatalytic nanoparticle (D), which is one or more selected from titanium oxide, tin oxide and tungsten oxide.

Multimode optical fibers are disclosed herein. In some embodiment disclosed herein, a multimode optical fiber having a bandwidth of greater than 2 GHz.Math.km includes: a glass matrix having a front endface, a back endface, a length (L), a refractive index n.sub.20 and a central axis (AC); and a plurality of cores arranged within the glass matrix, wherein the plurality of cores run generally parallel to the central axis between the front and back endfaces and having respective refractive indices n.sub.50, wherein n.sub.50>n.sub.20, wherein the glass matrix serves as a common cladding for the plurality of cores so that each core and the common cladding define a waveguide, wherein each core is a single mode at an operating wavelength; and wherein any two cores have an center-to-center spacing s of 3 μm to 20 μm and a coupling coefficient of greater than 10 m.sup.−1 but less than 200 m.sup.−1.