An optical fiber curing component includes a first tube comprising a first body defining a first interior surface and a first exterior surface, the first tube defining a first aperture and a second aperture on opposite ends of a first cavity, wherein the first tube defines a central axis extending through the first cavity; light sources coupled to the first body of the first tube and configured to emit light toward the central axis of the first tube, wherein each of the light sources intersect a common plane defined perpendicular to the central axis of the first tube; a silica glass article, having an anti-reflective coating, disposed between each of the plurality of light sources and the central axis of the first tube; and a reflective coating positioned on the interior surface of the first body and configured to reflect the light toward the central axis of the first tube.

A light irradiation device includes at least one irradiation unit including a reflective surface which is disposed in a concave inner surface formed to have a substantially arc shape and into which a wire member is inserted, and a light source which is configured to emit light toward the wire member and is disposed so as to face the reflective surface in a direction of an optical axis of the emitted light, and an insertion portion configured to interiorly form an insertion path for inserting the wire member into the reflective surface. The reflective surface is disposed such that a center of the substantially arc shape is eccentric with respect to a center of the insertion path.

An optical fiber ribbon is intermittently connected in a length direction by an intermittent connection which includes a polyol having a weight-average molecular weight of 3000 to 4000 in a specific amount relative to the entire intermittent connection and which has Young's modulus at 23 C. within a specific range. When collectively unitizing optical fiber ribbons to form an optical fiber cable, an optical fiber ribbon is formed which maintains advantages of the optical fiber ribbon and which prevents cracks of the intermittent connection and detachment of the intermittent connection from a colored optical fiber core when the cable is subjected to repetitive ironing.

An optical fiber ribbon is intermittently connected in a length direction by an intermittent connection which includes a polyol having a weight-average molecular weight of 3000 to 4000 in a specific amount relative to the entire intermittent connection and which has Young's modulus at 23 C. within a specific range. When collectively unitizing optical fiber ribbons to form an optical fiber cable, an optical fiber ribbon is formed which maintains advantages of the optical fiber ribbon and which prevents cracks of the intermittent connection and detachment of the intermittent connection from a colored optical fiber core when the cable is subjected to repetitive ironing.

The present disclosure relates to a method and apparatus for constraining an optical fiber (104) in the draw tower (100, 101). The method (700) includes steps of trapping (714) the optical fiber (104) in a central position along a vertical axis (Y-Y) by one or more acoustic waves generated by an acoustic centering apparatus (112). In particular, the vertical axis (Y-Y) is parallel to a draw tower axis (Y-Y) and/or coincides with the draw tower axis (Y-Y). The movement of the optical fiber (104) is constrained within 1 milli-meter from the vertical axis (Y-Y) with a coating ovality of a coated optical fiber (105) is less than 4%.

A device for applying radiation to a target is provided. The device includes a radiation emitter to emit electromagnetic radiation having a peak emission wavelength in the range from 10 nm-1 mm, and a first reflector that extends in a length direction with a concave cross section. The first reflector defines a cavity area having a perimeter, and includes an inward facing reflective border for at least 50% of the perimeter of the cavity area. Radiation is provided to the cavity area with an intensity distribution I and a maximum intensity I.sub.max. The cavity area includes a focal area defined by all points at which a normalized intensity I/I.sub.max is greater than 0.2. A width of the focal area is 0.0001-0.5 times a width of the cavity area.

A bend-resistant mini optical fiber and manufacturing method thereof, first, preparing a preform via a modified chemical vapor deposition process, and manufacturing an optical fiber via drawing at a certain temperature. The advantageous of the present invention are as following, the bend-resistant mini optical fiber is primarily formed by a core layer, a platform layer, a depression layer, an outer cladding layer and a coating layer, and the relative refractive index and radius of each of the layers is reasonably controlled; and a cutoff wavelength is effectively controlled by employing an automatic temperature and tension monitoring procedure during the drawing process, such that the cutoff wavelength and a mode field diameter are maintained in a relatively stable range, and the cutoff wavelength is adjusted upward while the mode field diameter remains stable, thus facilitating a decrease of bend loss of the optical fiber.

A light irradiation device includes a light source having a plurality of solid-state elements disposed on a substrate to be defined by a first direction and a second direction in a plurality of rows and irradiate the irradiation target with light from a third direction, an optical element refracting light from the solid-state elements, emitting the light and narrowing a spread angle of light to be emitted from the solid-state elements relative to the third direction, a first reflection portion having at least two first reflection surfaces on a downstream side in the third direction of the irradiation target and reflecting a part of light incident on the first reflection surface to the irradiation target, and a second reflection portion having a pair of second reflection surfaces disposed between the optical element and the first reflection portion and guiding light from the optical element to the first reflection surface.

One embodiment of the disclosure relates to a fiber coating apparatus having a fiber entrance opening, a conical section with walls tapered at half angles between 2 and 25 and height (also referred to as length herein) L.sub.1 between 0.25 mm and 2 mm, and a cylindrical land portion of diameter d.sub.2 between 0.1 and 0.5 mm and height (length) L.sub.2 between 0.05 and 1.25 mm.

One embodiment of the disclosure relates to a fiber coating apparatus having a fiber entrance opening, a conical section with walls tapered at half angles between 2 and 25 and height (also referred to as length herein) L.sub.1 between 0.25 mm and 2 mm, and a cylindrical land portion of diameter d.sub.2 between 0.1 and 0.5 mm and height (length) L.sub.2 between 0.05 and 1.25 mm.