Abstract: A method for adjusting a transmission wavelength of signal light transmitted through an optical waveguide device provided with one or more optical waveguides through which the signal light having a wavelength of 1520 nm to 1560 nm and blue light having a wavelength of 375 nm to 455 nm pass, a groove through which the waveguide passes, and resin filled in the groove, including a step of passing the signal light and the blue light through the same or mutually different one or more optical waveguides and of passing the signal light and the blue light through the same or mutually different resin, the latter step changing a refractive index of the resin by irradiating the resin with the blue light so as to change the transmission wavelength of the signal light transmitted through the resin in accordance with a change in the refractive index of the resin.

Abstract: An optical module includes two components that are optically connected, and includes a glass layer disposed in a region including an optical connection portion between the two components, at least one component includes a thin tube through which outside air is introduced, and an end face of the thin tube is in contact with the glass layer.

Abstract: To provide a planar lightwave circuit capable of being optically connected to a semiconductor optical element or an optical wiring component in a simple, precise, and stable manner without an increase in circuit footprint or the number of fabrication steps or a deterioration of characteristics. By arranging a dummy optical waveguide having a mirror function in the vicinity of an input/output waveguide of an optical functional circuit forming the planar lightwave circuit, a semiconductor optical element or an optical wiring component can be easily aligned with and fixed to the optical functional circuit by monitoring the reflection light intensity from the dummy optical waveguide. When the optical functional circuit has a plurality of input/output waveguides to be optically connected, each input/output waveguide can be identified if the dummy optical waveguides having the mirror function have different reflection properties (such as reflectance, width, position, or reflection wavelength).

Abstract: An optical module includes a planar lightwave circuit optically connected to an optical fiber; a fiber block to which the optical fiber is fixed; and a glass layer that bonds and fixes the fiber block and the planar lightwave circuit. The glass layer is provided in a portion through which light passes between the optical fiber and the planar lightwave circuit in a gap between the connection end face of the fiber block and the connection end face of the planar lightwave circuit. The optical module further includes a thin tube. The thin tube may be provided to penetrate the fiber block. The thin tube can be provided so as to penetrate the planar lightwave circuit or a fixture plate mounted on the planar lightwave circuit.

Abstract: There is provided an optical waveguide chip. In the optical waveguide chip, an optical waveguide circuit includes a substrate, a lower clad layer laminated on the substrate, a core layer that is laminated on the lower clad layer and corresponds to a propagation path of an optical signal, and an upper clad layer laminated on the core layer; the upper and lower clad layers in a region that does not correspond to the propagation path of the optical signal are removed across to an edge of the chip; the region from which the upper and lower clad layers have been removed is filled with a light absorbing material; and a height of the filled light absorbing material is higher than a height of an uppermost surface of the upper clad layer.

Abstract: To manufacture an optical waveguide including a substrate, a lower cladding layer formed on the substrate, a core layer formed on the lower cladding layer, a sinking prevention layer formed to cover the core layer and the lower cladding layer, and an upper cladding layer formed on the sinking prevention layer, in which the sinking prevention layer is composed of a material having a higher melting point than that of a material composing the lower cladding layer.

Abstract: There is provided an optical wavelength suppressed in sinking of the core layer into the underlying cladding layer in the heat treatment of the manufacturing process, thereby enabling the reduction of the loss of the visible light waveguide, and suppressed in variations in the substrate plane in the optical waveguide shape. The optical waveguide includes: a substrate, an underlying cladding layer formed on the substrate, an etching stopping layer formed on the underlying cladding layer, a core layer formed on the etching stopping layer, and an overlying cladding layer formed on the core layer and the etching stopping layer. The optical waveguide is characterized in that the etching stopping layer includes a material having a smaller etching rate than that of a material forming the core layer, and having a higher softening point than that of the material forming the core layer.

Abstract: An end portion structure of a transmission line of the present invention is a structure in which a protective film with a thickness of 0.5 ?m to 3.0 ?m is formed on the end surface of the transmission line in place of an end cap formed in an end portion of a transmission line in the related art, and no adhesive is used in a portion through which light passes. The protective film on the end surface works to suppress a bulge of the core. The thickness of the protective film is significantly thinner than the end cap, and thus waveguides facing each other can be brought close to each other. It is possible to reduce the connection loss between two fibers or waveguides facing each other to be 0.5 dB or less. Since no adhesive is used, there is no loss increase caused by adhesive deterioration.

Abstract: To provide an optical connector that can prevent degradation of end faces of cores using a simple structure. The optical connector is adapted to connect single-mode optical fibers for visible light with a wavelength of less than or equal to 650 nm to ultraviolet light, specifically, connect the optical fibers by allowing ferrules having fixed thereto the respective optical fibers to be inserted into a sleeve and allowing the ferrules to butt against each other, in which a film of nitride, oxide, or fluoride is formed on an end face of each of the optical fibers and the ferrules.

Abstract: Provided is a fringe projection device capable of adjusting resolution and measurement accuracy without increasing the number of light sources, performing position adjustment of the emission point and the surface to be inspected, or increasing device costs and measurement procedures. A waveguide-type optical phase modulator of the present invention includes a waveguide-type optical element in which an optical waveguide is formed on a substrate, the waveguide-type optical element including: at least one input waveguide to which an optical signal is input; a one-input and N-output (N is an integer of 2 or more) branch waveguide that is optically connected to an output of the input waveguide; 1×M (M is an integer of 2 or more) optical switches that are optically connected to outputs of the branch waveguide; (N×M) phase shifters that are optically connected to outputs of the optical switches; and (N×M) output waveguides that are optically connected to outputs of the phase shifters.

Abstract: To provide a planar lightwave circuit capable of being optically connected to a semiconductor optical element or an optical wiring component in a simple, precise, and stable manner without an increase in circuit footprint or the number of fabrication steps or a deterioration of characteristics. By arranging a dummy optical waveguide having a mirror function in the vicinity of an input/output waveguide of an optical functional circuit forming the planar lightwave circuit, a semiconductor optical element or an optical wiring component can be easily aligned with and fixed to the optical functional circuit by monitoring the reflection light intensity from the dummy optical waveguide. When the optical functional circuit has a plurality of input/output waveguides to be optically connected, each input/output waveguide can be identified if the dummy optical waveguides having the mirror function have different reflection properties (such as reflectance, width, position, or reflection wavelength).

Abstract: A method for adjusting a transmission wavelength of signal light transmitted through an optical waveguide device provided with one or more optical waveguides through which the signal light having a wavelength of 1520 nm to 1560 nm and blue light having a wavelength of 375 nm to 455 nm pass, a groove through which the waveguide passes, and resin filled in the groove, including a step of passing the signal light and the blue light through the same or mutually different one or more optical waveguides and of passing the signal light and the blue light through the same or mutually different resin, the latter step changing a refractive index of the resin by irradiating the resin with the blue light so as to change the transmission wavelength of the signal light transmitted through the resin in accordance with a change in the refractive index of the resin.

Abstract: A fringe projector apparatus includes: a phase modulator having a first waveguide, a second waveguide, and a plurality of heaters including a first heater and a second heater, wherein the first and second waveguides and the plurality of heaters are provided on a single substrate, and wherein the first heater heats the first waveguide and the second heater heats a position away from the first waveguide; a light source that generates a light beam to be input to the first waveguide and the second waveguide; and a controller that controls a phase difference between the first waveguide and the second waveguide by changing an electric power consumption of the first heater under a condition that a total electric power consumption of the plurality of heaters is constant.

Abstract: An illumination apparatus generates an interference fringe. An input arm receives an input light beam from a light source. A splitter splits the input light beam that has passed through the input arm into a first output arm and a second output arm. A phase modulator changes a phase difference between the output light beams of the first output arm and the second output arm. A phase detector detects the phase difference between output light beams respectively output from the first output arm and the second output arm based on a return light beam generated by combining a first reflected light beam and a second reflected light beam respectively reflected by ends of the first output arm and the second output arm.

Abstract: An optical measurement apparatus includes a light projector that projects a patterned light, and an imager that captures an image of a target onto which the patterned light has been projected. The light projector and the imager are fixed to each other via a mounting face that intersects both a projection axis direction of the light projector and an image acquisition axis direction of the imager.

Abstract: An illumination apparatus generates an interference fringe. An input arm receives an input light beam from a light source. A splitter splits the input light beam that has passed through the input arm into a first output arm and a second output arm. A phase modulator changes a phase difference between the output light beams of the first output arm and the second output arm. A phase detector detects the phase difference between output light beams respectively output from the first output arm and the second output arm based on a return light beam generated by combining a first reflected light beam and a second reflected light beam respectively reflected by ends of the first output arm and the second output arm.

Abstract: A fringe projector apparatus includes: a phase modulator having a first waveguide, a second waveguide, and a plurality of heaters including a first heater and a second heater, wherein the first and second waveguides and the plurality of heaters are provided on a single substrate, and wherein the first heater heats the first waveguide and the second heater heats a position away from the first waveguide; a light source that generates a light beam to be input to the first waveguide and the second waveguide; and a controller that controls a phase difference between the first waveguide and the second waveguide by changing an electric power consumption of the first heater under a condition that a total electric power consumption of the plurality of heaters is constant.