Abstract: To provide an optical connecting member capable of positioning and connecting a coated fiber by a simple connecting work with high precision, and a method of fitting the same.

Abstract: It is an object to obtain an optical connector capable of executing an assembling work safely and easily without causing a problem, for example, a breakage of an end face of a short optical fiber provided in a ferrule when assembling a site optical fiber, and a method of assembling the optical connector. In an optical connector having a ferrule 3 including a short optical fiber 12 and a positioning mechanism 5 for placing and fixing an optical fiber 14 to be connected to the short optical fiber 12 in a predetermined position, an end face of the short optical fiber 12 and that of the optical fiber 14 are matched with each other through an almost sheet-like protecting member 17 for transmitting a light in a predetermined refractive index and the optical fiber 14 is positioned by an application of an elastic force to the short optical fiber 12 side.

Abstract: An optical connector in which works of attaching an incorporated optical fiber to a ferrule, removing a coating of the tip end side of a coated optical fiber, and attaching an optical connector to the coated optical fiber can be made more efficient, and the transmission characteristics can be prevented from being lowered in the optical connector, and a method of attaching the optical connector to a coated optical fiber are provided. An optical connector 101 includes: a ferrule 140 into which a glass fiber 121 that is obtained by peeling a coating 124 of a coated optical fiber 120 is to be inserted; a fixing portion 130 which fixes the coated optical fiber 120 inserted into the ferrule 140; and a coating-removing portion 110 which removes the coating 124 from an end portion of the coated optical fiber 120, by means of a force of inserting the coated optical fiber 120 into the optical connector 101.

Abstract: An optical fiber cutting device and method, and optical fiber cutting blade member in which excellent workability is obtained by a simple configuration, and a cost reduction can be attained are provided.

Abstract: The present invention relates to an optical connector and an optical connector assembling method allowing simplification of assembly, improvement of reliability, and lower prices. The optical connector comprises a connector plug for holding a coated optical fiber and a connector socket for holding a coated optical fiber. The connector plug has a fiber holding portion disposed in a plug housing, and a fiber inserting hole is provided in the fiber holding portion. A fiber deflection space for allowing deflection of the coated optical fiber, when the coated optical fibers are butted, is provided in the plug housing. The connector socket has a fiber holding portion disposed in a socket housing, and a fiber inserting hole is provided in the fiber holding portion. A fiber deflection space for allowing deflection of the coated optical fiber, when the coated optical fibers are butted, is provided in the socket housing.

Abstract: An optical fiber sheet comprises optical fibers sandwiched between sheet members and fixed thereto. Distal ends of the optical fibers extend from outer peripheral edges of the sheet members with resin coatings applied to the distal ends to produce extensions. The distal ends of the extensions are inserted into fiber holes of connectors with the resin coatings applied to the distal ends to be connected with the connectors.

Abstract: There are provided an optical fiber cutting method and a cutting apparatus which can easily cut a coated optical fiber without a step of removing a coating from the optical fiber. It includes a clamp which holds the coated optical fiber, having a glass fiber and the coating, on both sides of a portion-to-be-cut, a disk-shaped blade member which moves at the portion-to-be-cut in a direction orthogonal to an axis of the optical fiber to cut the coating and to provide a slit into the glass fiber, and a support which presses, with a predetermined pressing force, the portion-to-be-cut from an opposite side of the blade member with respect to the portion-to-be-cut when cutting the coating and providing the slit into the glass fiber. A head of the support is formed with a groove along a sliding direction of the blade member.

Abstract: A method of producing an optical waveguide connector in which the productivity of a ferrule member can be improved, and the connection loss with a counter connector can be suppressed to a low level is obtained. An optical waveguide connector 11 is obtained by performing: an aligning step of restricting the position of the tip end of an optical waveguide 2 passed through an insertion hole 13b of a ferrule member 13, by a positioning portion of a positioning member 16 which is opposedly placed at the tip end of the ferrule member 13, thereby aligning the optical waveguide 2 to the ferrule member 13; and a bonding step of filing a gap between the optical waveguide 2 which is passed through the insertion hole 13b, and the insertion hole 13b, with an adhesive agent to fix the optical waveguide 2 to the ferrule member 13.

Abstract: An optical component as an embodiment of the present invention comprises an optical waveguide. This optical waveguide is a single optical waveguide having a first position and a second position along a longitudinal direction thereof. In this optical waveguide, cross-sectional refractive index profiles vary along the longitudinal direction between the first position and the second position. In this optical waveguide, at a predetermined wavelength to become a single mode at the first position, an overlap rate between a field distribution of light having propagated from the first position and having arrived at the second position, and a Gaussian distribution is not less than 90%.

Abstract: The present invention relates to an optical fiber having a structure which allows further improvements to be made both in terms of lower reflectance and narrower bandwidth, and to a fiber grating type filter including the optical fiber. The optical fiber applied to the fiber grating type filter comprises a core region extending along a predetermined axis, and a cladding region provided on an outer periphery of the core region. The core region does not contain any photosensitive dopant which contributes to predetermined wavelength light photosensitivity as a glass property, but a part of the cladding region contain such a photosensitive dopant. By means of this composition, it is possible to form a grating, which has a grating plane slanted by a predetermined angle with respect to the optical axis, in a part of the cladding region surrounding the core region.

Abstract: An optical fiber sheet comprises optical fibers sandwiched between sheet members and fixed thereto. Distal ends of the optical fibers extend from outer peripheral edges of the sheet members with resin coatings applied to the distal ends to produce extensions. The distal ends of the extensions are inserted into fiber holes of connectors with the resin coatings applied to the distal ends to be connected with the connectors.

Abstract: The present invention relates to an optical connector and an optical connector assembling method allowing simplification of assembly, improvement of reliability, and lower prices. The optical connector comprises a connector plug for holding a coated optical fiber and a connector socket for holding a coated optical fiber. The connector plug has a fiber holding portion disposed in a plug housing, and a fiber inserting hole is provided in the fiber holding portion. A fiber deflection space for allowing deflection of the coated optical fiber, when the coated optical fibers are butted, is provided in the plug housing. The connector socket has a fiber holding portion disposed in a socket housing, and a fiber inserting hole is provided in the fiber holding portion. A fiber deflection space for allowing deflection of the coated optical fiber, when the coated optical fibers are butted, is provided in the socket housing.

Abstract: The present invention is directed to a gain equalizer having a preferable equalization characteristic and a structure that can be easily fabricated. The gain equalizer flattens a spectrum of light in a predetermined wavelength range inputted through an input terminal and outputs the light from an output terminal, and comprises a coarse-tunable equalizing section and a fine-tunable equalizing section connected in series. The coarse-tunable equalizing section coarsely flattens the spectrum of the light in the predetermined wavelength range, and includes a plurality of filters each having a large loss and a small reflectance as compared with the fine-tunable equalizing section. The fine-tunable equalizing section flattens the spectrum of the light in a wavelength range where the coarse-tunable equalizing section can not flatten at a predetermined value or less among the predetermined wavelength range.

Abstract: In a method of making a diffraction grating device, an optical waveguide is irradiated, by way of a phase grating mask, with refractive index modulation inducing light so as to form a diffraction grating in the predetermined region. This method comprises (1) a step of measuring a diffraction efficiency distribution of the phase grating mask; and (2) a step of longitudinally scanning the optical waveguide with the refractive index modulation inducing light by way of the phase grating mask and irradiating the optical waveguide with the refractive index modulation inducing light so as to modulate a refractive index of the predetermined region. Upon scanning with the refractive index modulation inducing light, longitudinal relative positions of the phase grating mask and optical waveguide are changed according to the diffraction efficiency distribution of the phase grating mask.

Abstract: In this diffraction grating device manufacturing method, refractive-index-change-inducing light of a wavelength that induces a change in refractive index is irradiated onto an optical waveguide, thus forming a diffraction grating through refractive index modulation along the longitudinal direction of the optical waveguide. At this time, the position of irradiation of the refractive-index-change-inducing light onto the optical waveguide is swung in a direction perpendicular to the longitudinal direction of the optical waveguide.

Abstract: The present invention relates to an optical fiber having a structure which allows further improvements to be made both in terms of lower reflectance and narrower bandwidth, and to a fiber grating type filter including the optical fiber. The optical fiber applied to the fiber grating type filter comprises a core region extending along a predetermined axis, and a cladding region provided on an outer periphery of the core region. The core region does not contain any photosensitive dopant which contributes to predetermined wavelength light photosensitivity as a glass property, but a part of the cladding region contain such a photosensitive dopant. By means of this composition, it is possible to form a grating, which has a grating plane slanted by a predetermined angle with respect to the optical axis, in a part of the cladding region surrounding the core region.

Abstract: According to the present invention, a periodically perturbation part which serves as a refractive index modulated part is provided in a part of the optical waveguide of an optical fiber or the like in the longitudinal direction thereof, a line perpendicular to a level plane of this periodically perturbation part is tilted with respect to the optical axis X of the optical waveguide, and the plane defined by this optical axis X and a line A intersecting the optical axis X, that is, the deflection angle plane M is made, by twisting or the like, to include a portion that varies depending on the position of the optical waveguide in the longitudinal direction thereof.

Abstract: The present invention is directed to a gain equalizer having a preferable equalization characteristic and a structure that can be easily fabricated. The gain equalizer flattens a spectrum of light in a predetermined wavelength range inputted through an input terminal and outputs the light from an output terminal, and comprises a coarse-tunable equalizing section and a fine-tunable equalizing section connected in series. The coarse-tunable equalizing section coarsely flattens the spectrum of the light in the predetermined wavelength range, and includes a plurality of filters each having a large loss and a small reflectance as compared with the fine-tunable equalizing section. The fine-tunable equalizing section flattens the spectrum of the light in a wavelength range where the coarse-tunable equalizing section can not flatten at a predetermined value or less among the predetermined wavelength range.

Abstract: In a method of making a diffraction grating device, an optical waveguide is irradiated, by way of a phase grating mask, with refractive index modulation inducing light so as to form a diffraction grating in the predetermined region. This method comprises (1) a step of measuring a diffraction efficiency distribution of the phase grating mask; and (2) a step of longitudinally scanning the optical waveguide with the refractive index modulation inducing light by way of the phase grating mask and irradiating the optical waveguide with the refractive index modulation inducing light so as to modulate a refractive index of the predetermined region. Upon scanning with the refractive index modulation inducing light, longitudinal relative positions of the phase grating mask and optical waveguide are changed according to the diffraction efficiency distribution of the phase grating mask.

Abstract: In this diffraction grating device manufacturing method, refractive-index-change-inducing light of a wavelength that induces a change in refractive index is irradiated onto an optical waveguide, thus forming a diffraction grating through refractive index modulation along the longitudinal direction of the optical waveguide. At this time, the position of irradiation of the refractive-index-change-inducing light onto the optical waveguide is swung in a direction perpendicular to the longitudinal direction of the optical waveguide.