Abstract: An acoustic wave device includes a piezoelectric substrate, a support substrate bonded on the piezoelectric substrate, and a resonator formed on the other side of the support substrate on the piezoelectric substrate generates main-mode wave and transverse-mode wave when power is applied. The resonator includes a first bus bar, a second bus bar opposed to the first bus bar, a plurality of first electrode fingers connected to the side of the second bus bar in the first bus bar, a plurality of second electrode fingers connected to the side of the first bus bar in the second bus bar, a plurality of first dummy electrodes connected to the side of the second bus bar in the first bus bar, and a plurality of second dummy electrodes connected to the side of the first bus bar in the second bus bar.

Abstract: A semiconductor laser device includes a stem; a thermoelectric element provided at a position shifted to one side from a center of the stem, on an upper surface of the stem; a semiconductor laser configured to be temperature-controlled by the thermoelectric element; a heat dissipation block including a first portion, a second portion, and a third portion, the first portion being at least partially provided on a rear surface on a side opposite to the upper surface of the stem, the second portion being provided on the rear surface of the stem and extending from the first portion to just below the thermoelectric element, the third portion being provided on the one side on a side surface of the stem; and a plurality of lead pins provided around the second portion and penetrating through the stem from the upper surface to the rear surface.

Abstract: Provided here are: a mounting section having a light-emitting element for emitting an optical signal; a mounting section arranged alongside the mounting section and having a light-emitting element for emitting an optical signal that is different in wavelength from the optical signal; and an optical multiplexer having a filter for transmitting therethrough only the wavelength of the optical signal, a mirror for reflecting the optical signal transmitted through the filter, and a filter arranged alongside the filter, for transmitting therethrough only the wavelength of the optical signal, and for reflecting the optical signal reflected by the mirror and multiplexing it with the transmitted optical signal; wherein the light-emitting element is mounted in the mounting section to be displaced toward the light-emitting element from a center in a width direction across an emission direction of the optical signal.

Abstract: Provided here are: a mounting section having a light-emitting element for emitting an optical signal; a mounting section arranged alongside the mounting section and having a light-emitting element for emitting an optical signal that is different in wavelength from the optical signal; and an optical multiplexer having a filter for transmitting therethrough only the wavelength of the optical signal, a mirror for reflecting the optical signal transmitted through the filter, and a filter arranged alongside the filter, for transmitting therethrough only the wavelength of the optical signal, and for reflecting the optical signal reflected by the mirror and multiplexing it with the transmitted optical signal; wherein the light-emitting element is mounted in the mounting section to be displaced toward the light-emitting element from a center in a width direction across an emission direction of the optical signal.

Abstract: A method of manufacturing an optical multiplexer/demultiplexer includes the steps of: detachably holding optical filters and a mirror respectively to one surface and to the other surface of a pair of mutually parallel surfaces of gripping jigs; gripping a block holder between the gripping jigs with interposition of adhesive layers so as to reflect the parallelism of the pair of the surfaces; heating the gripping jigs gripping the block holder; and cooling the gripping jigs with them gripping the block holder. The optical filters and the mirror are thereby bonded to the block holder in parallel to each other.

Abstract: A method of manufacturing an optical multiplexer/demultiplexer includes the steps of: detachably holding optical filters and a mirror respectively to one surface and to the other surface of a pair of mutually parallel surfaces of gripping jigs; gripping a block holder between the gripping jigs with interposition of adhesive layers so as to reflect the parallelism of the pair of the surfaces; heating the gripping jigs gripping the block holder; and cooling the gripping jigs with them gripping the block holder. The optical filters and the mirror are thereby bonded to the block holder in parallel to each other.

Abstract: A semiconductor laser (1) emits laser light. An electro-absorption optical modulator (2) modulates the laser light. The electro-absorption optical modulator (2) includes a plurality of electro-absorption regions (2a, 2b, 2c) having different extinction characteristics, whereby the extinction ratio curve of the optical device can be controlled to have a shape with multiple steps that is suited to driving conditions.

Abstract: A semiconductor laser (1) emits laser light. An electro-absorption optical modulator (2) modulates the laser light. The electro-absorption optical modulator (2) includes a plurality of electro-absorption regions (2a, 2b, 2c) having different extinction characteristics, whereby the extinction ratio curve of the optical device can be controlled to have a shape with multiple steps that is suited to driving conditions.

Abstract: A method for manufacturing a wavelength division multiplexing transmission apparatus, includes arranging laser devices in a line and fixing the laser devices to a first substrate, fixing to a second substrate reflectors arranged to multiplex laser beams emitted from the laser devices and to generate wavelength multiplexed light, and arranging collimator lenses on paths of the laser beams, adjusting positions of the collimator lenses so that the laser beams making up the wavelength multiplexed light become parallel and, thereafter, fixing the collimator lenses to the first substrate.

Abstract: An optical transmission apparatus includes a wavelength multiplexing unit that performs wavelength multiplexing with respect to dummy light for each channel of WDM and dummy light for each sub-band including the channels in plural; and a selecting unit that measures for each sub-band and corresponding to intensity of the channel-specific dummy light, transmission characteristics at a reception end, and according to measurement results, selects for each of the sub-bands, any one among the channel-specific dummy light and the sub-band-specific dummy light. The wavelength multiplexing unit wavelength multiplexes any of the channel-specific dummy light selected for each of the sub-bands by the selecting unit.

Abstract: The invention relates to a highly durable building material and a method for producing the same. The building material prevents the substrate or an intermediate resin layer from being decomposed by photoradicals that may be generated from zinc oxide. Provided is a building material in which an ultraviolet protection layer containing zinc oxide particles and silica particles is formed directly on the surface of a substrate or indirectly with an intermediate resin layer interposed between the substrate and the ultraviolet protection layer. The silica particles are fixed to the substrate or the intermediate resin layer.

Abstract: A pre-emphasis control method includes calculating an average value of transmission characteristics based on transmission characteristics of a plurality of light beams received by a receiver, and determining that, among signals of the plurality of light beams, a wavelength with a deviation from the average value is a wavelength at which control is to be performed, determining that the wavelength at which control is to be performed and a wavelength adjacent thereto are a group of wavelengths at which control is to be performed, obtaining an average of transmission characteristics of the group of wavelengths at which control is to be performed, and based on a difference between averaged transmission characteristics and respective transmission characteristics of the group of wavelengths at which control is to be performed, changing a light intensity output from each transmitter that transmits a group of wavelengths at which control is to be performed.

Abstract: A method for manufacturing a wavelength division multiplexing transmission apparatus, includes arranging laser devices in a line and fixing the laser devices to a first substrate, fixing to a second substrate reflectors arranged to multiplex laser beams emitted from the laser devices and to generate wavelength multiplexed light, and arranging collimator lenses on paths of the laser beams, adjusting positions of the collimator lenses so that the laser beams making up the wavelength multiplexed light become parallel and, thereafter, fixing the collimator lenses to the first substrate.

Abstract: An optical transmission apparatus includes a wavelength multiplexing unit that performs wavelength multiplexing with respect to dummy light for each channel of WDM and dummy light for each sub-band including the channels in plural; and a selecting unit that measures for each sub-band and corresponding to intensity of the channel-specific dummy light, transmission characteristics at a reception end, and according to measurement results, selects for each of the sub-bands, any one among the channel-specific dummy light and the sub-band-specific dummy light. The wavelength multiplexing unit wavelength multiplexes any of the channel-specific dummy light selected for each of the sub-bands by the selecting unit.

Abstract: There are provided a polarized light passing device to pass therethrough specific polarized light, of output light of a polarization scrambler; and a detecting unit to detect a modulation component according to a frequency of a polarization control signal from the light which passes through the polarized light passing device.

Abstract: A pre-emphasis control method includes calculating an average value of transmission characteristics based on transmission characteristics of a plurality of light beams received by the receiver, and determining that, among signals of the plurality of light beams, a wavelength with a deviation from the average value is a wavelength at which control is to be performed, determining that the wavelength at which control is to be performed and a wavelength adjacent thereto are a group of wavelengths at which control is to be performed, obtaining an average of transmission characteristics of the group of wavelengths at which control is to be performed, and changing a light intensity output from each transmitter that transmits a group of wavelengths at which control is to be performed based on a difference between averaged transmission characteristics and respective transmission characteristics of the group of wavelengths at which control is to be performed.

Abstract: There are provided a polarized light passing device to pass therethrough specific polarized light, of output light of a polarization scrambler; and a detecting unit to detect a modulation component according to a frequency of a polarization control signal from the light which passes through the polarized light passing device.

Abstract: A semiconductor device includes a power device formed on a semiconductor substrate; a plurality of transistors formed on the semiconductor substrate; a first insulating film formed on the semiconductor substrate so as to cover the power device and the plurality of transistors; an interconnect layer formed on the first insulating film and including a second insulating film, an interconnect formed in the second insulating film and dummy patterns formed in the second insulating film in a region where the interconnect is not formed; and a power electrode corresponding to an uppermost layer interconnect formed on the interconnect layer and electrically connected to the power device. It further includes uppermost layer dummy patterns uniformly provided on the interconnect layer in a region where the uppermost layer interconnect is not formed.

Abstract: An application apparatus is provided with an object supporting section including a support surface for supporting an object; a tape carrying section for rotatably carrying, in a roll form, a double-coated pressure sensitive adhesive tape with a release paper attached to one side of the tape; and a tape laying section for holding the double-coated pressure sensitive adhesive tape with the release paper, fed in a strip form from the tape carrying section, in a condition where the tape is laid on the support surface of the object supporting section with an adhesive surface of the tape to which the release paper is not attached facing outward. Further provided is a tape cutting section.

Abstract: A pollution control element-retaining or -mounting member (2) for mounting a pollution control element (1) within a casing and that shows good canning operability, that is not separated from the pollution control element during the canning operation, and that is excellent in one, some or all of heat resistance, an aerial pressure retaining property and erosion resistance. The pollution control element-mounting member (1) comprises a mat (2) containing fiber material, with the mat having a thickness with an external portion (2a) having an external peripheral surface for contacting the casing (4) and an internal portion (2b) having an internal peripheral surface for contacting the pollution control element (1).