Provided is an optical fiber illumination device in which optical fibers produced without using a special method is used and the amount of light emitted from the side surface is improved. An optical fiber illumination device 1 includes: an optical fiber bundle 10 having a plurality of optical fibers, a resin jacket 101 that covers a bundle of the plurality of optical fibers and emits light, a first end, and a second end, the first end and the second end being polished; and a first light source placed close to the first end so as to emit light in a range of angles larger than an angular aperture of the plurality of optical fibers toward the optical fiber bundle.

The disclosure relates to an optical connection device reducing a connection loss between an SCF and an MCF. The optical connection device includes plural relay fibers and a capillary having third and fourth end faces. Each relay fiber includes a first core of Δ1, a second core of Δ2, and a cladding of Δ3. The capillary includes a tapered portion with an outer diameter ratio R of the fourth end face to the third end face of 0.2 or less. In each relay fiber, a value of Formula (V2−V1)/R falls within a range from 156% μm.sup.2 to 177% μm.sup.2, V1 (% μm.sup.2) is given by (π.Math.r1.sub.b.sup.2)×(Δ1−Δ2) by using a radius r1.sub.b (μm) of the first core, and V2 (% μm.sup.2) is given by (π.Math.r2.sub.b.sup.2)×(Δ1−Δ2) by using a radius r2.sub.b (μm) of the second core.

An optical coupler includes: input-type optical fibers; an output-type optical fiber; and radiant light processing units. The input-type optical fibers are bundled at leading end side to form a fiber bundle portion, and leading end portion of the fiber bundle portion is connected to the output-type optical fiber. In at least either the input-type optical fibers or the output-type optical fiber, a tapered portion is formed in which cross-sectional area is tapered to become narrower in light traveling direction indicating direction from the input-type optical fibers toward the output-type optical fiber. The number of the tapered portion is equal to or greater than two. Each radiant light processing unit is disposed to mutually overlap with one of the tapered portions or away from one of the tapered portions in the light traveling direction, and is disposed on outer periphery of the input-type optical fibers or the output-type optical fiber.

An optical device. The optical device includes a zonal objective array comprising an array of objectives. The optical device further includes a zonal fiber-optic inversion bundle. The zonal fiber-optic inversion bundle includes a plurality of sub-bundles, each sub-bundle having an input coupled to a corresponding objective in the zonal objective array. The optical device further includes a zonal eyepiece array comprising an array of eyepieces. Each of the eyepieces in the zonal eyepiece array is coupled to an output of a corresponding sub-bundle in the zonal fiber-optic inversion bundle.

An optical device. The optical device includes a zonal objective array comprising an array of objectives. The optical device further includes a zonal fiber-optic inversion bundle. The zonal fiber-optic inversion bundle includes a plurality of sub-bundles, each sub-bundle having an input coupled to a corresponding objective in the zonal objective array. The optical device further includes a zonal eyepiece array comprising an array of eyepieces. Each of the eyepieces in the zonal eyepiece array is coupled to an output of a corresponding sub-bundle in the zonal fiber-optic inversion bundle.

An article includes an optical transforming layer and a guide region positioned inside and adjacent to at least a portion of a perimeter of the optical transforming layer. The guide region comprises an inlet end positioned adjacent to a first surface of the optical transforming layer and an outlet end positioned adjacent a second surface of the optical transforming layer. The guide region propagates light from the inlet end to the outlet end such that the light is directed from the first surface to the second surface. The guide region includes a phase-separated glass comprising a continuous network phase and a discontinuous phase. A relative difference in index of refraction between the continuous network phase and the discontinuous phase is greater than or equal to 0.3%. The discontinuous phase comprises elongated shaped regions aligned along a common axis and having an aspect ratio greater than or equal to 10:1.

An article includes an optical transforming layer and a guide region positioned inside and adjacent to at least a portion of a perimeter of the optical transforming layer. The guide region comprises an inlet end positioned adjacent to a first surface of the optical transforming layer and an outlet end positioned adjacent a second surface of the optical transforming layer. The guide region propagates light from the inlet end to the outlet end such that the light is directed from the first surface to the second surface. The guide region includes a phase-separated glass comprising a continuous network phase and a discontinuous phase. A relative difference in index of refraction between the continuous network phase and the discontinuous phase is greater than or equal to 0.3%. The discontinuous phase comprises elongated shaped regions aligned along a common axis and having an aspect ratio greater than or equal to 10:1.

An endpoint detection system for enhanced spectral data collection is provided. An optical bundle is coupled to a light source configured to generate incident light. The optical bundle includes two or more sets of optical fibers that each include an emitting optical fiber and a receiving optical fiber. The receiving optical fibers are disposed within the optical bundle at a pairing angle relative to a respective emitting optical fiber. The optical bundle is also coupled to a collimator assembly that includes an achromatic lens. The achromatic lens receives a first light beam of incident light from a first emitting optical fiber and directs spectral components of the first light beam to a first and second portion of a surface of a substrate. The first portion of the substrate surface is substantially the same as the second portion. The achromatic lens collects reflected spectral components that are produced by the spectral components directed to the first and second portions of the substrate surface. The achromatic lens transmits the reflected spectral components to a first receiving fiber of the optical fiber bundle, which transmits the reflected spectral components to a light detection component. A processing device coupled to the light detection component determines a reflectance of the substrate surface based on the reflected spectral components.

An endpoint detection system for enhanced spectral data collection is provided. An optical bundle is coupled to a light source configured to generate incident light. The optical bundle includes two or more sets of optical fibers that each include an emitting optical fiber and a receiving optical fiber. The receiving optical fibers are disposed within the optical bundle at a pairing angle relative to a respective emitting optical fiber. The optical bundle is also coupled to a collimator assembly that includes an achromatic lens. The achromatic lens receives a first light beam of incident light from a first emitting optical fiber and directs spectral components of the first light beam to a first and second portion of a surface of a substrate. The first portion of the substrate surface is substantially the same as the second portion. The achromatic lens collects reflected spectral components that are produced by the spectral components directed to the first and second portions of the substrate surface. The achromatic lens transmits the reflected spectral components to a first receiving fiber of the optical fiber bundle, which transmits the reflected spectral components to a light detection component. A processing device coupled to the light detection component determines a reflectance of the substrate surface based on the reflected spectral components.

An optical device includes a fiber array that has input optical fibers, a lens array that has lenses, a photodiode array that photodiodes, a first spacer disposed between the fiber array and the lens array, and a second spacer disposed between the lens array and the photodiode array. Each of the lenses collimates input light from a corresponding input optical fiber, from among the input optical fibers. Each of the photodiodes receives the input light collimated by a corresponding lens, from among the lenses, and outputs an electrical signal according to a power of the received input light. The first spacer transmits the input light from each of the input optical fibers to a corresponding lens from among the lenses. The fiber array, the first spacer, the lens array, the second spacer, and the photodiode array are laminated.