Abstract: An illumination apparatus includes light sources differing from one another in terms of light-emission color and voltage drop when identical current flows therein, switches in one-to-one correspondence with the light sources, a DC power supply circuit, and a control circuit. The control circuit performs a first control of the switches through a time division control method such that an on-period of each switch is not overlapped with that of any other switch. The control circuit also performs a second control to individually control at least one of a target current magnitude, flowing through each switch in the switched-on state, and a target on-period length of each switch, and to adjust a ratio of the plurality of light sources in terms of a product of the target current magnitude and the target on-period length.

Abstract: An optical module includes a single-mode optical fiber; a high relative refractive-index difference optical fiber having a larger core-to-cladding relative refractive-index difference than that of the single-mode optical fiber fusion-spliced to a first end of the high relative refractive-index difference optical fiber; a planar lightwave circuit that includes an optical waveguide having a core of quartz-based glass doped with a refractive-index raising dopant and a cladding of quartz-based glass, and is connected at a first end thereof to a second end, opposite to the first end, of the high relative refractive-index difference optical fiber; and a silicon thin-wire waveguide element that includes a silicon thin-wire waveguide having a silicon core and a cladding whose refractive index lower than that of the silicon core, and is connected to a second end, opposite to the first end, of the optical waveguide of the planar lightwave circuit.

Abstract: An optical waveguide structure includes: a cladding; a first core in the cladding having a first end surface; a second core in the cladding having a second end surface; slit formed horizontally with respect to a waveguide direction of the light to be waveguided by the first and second cores; and a first part and a second part composed of a material identical to a material of the cladding, wherein a pair of the first and second end surfaces disposed opposing each other with the slit interposed between the pair of the first and second end surfaces, the first part is interposed between the first end surface and the slit, and the second part is interposed between the second end surface and the slit.

Abstract: An optical waveguide circuit device includes: an optical waveguide circuit including a cladding layer formed on a substrate and made from silica-based glass, and an optical waveguide formed within the cladding layer and made from silica-based glass; heaters formed over the cladding layer and the optical waveguide and configured to heat the optical waveguide; wiring line electrode layers formed over the cladding layer, each of the wiring line electrode layers being coupled to a corresponding heater of the heaters and configured to allow electrical power to be supplied to the coupled heater; and an insulating layer covering the cladding layer, the heaters, and the wiring line electrode layers. The wiring line electrode layers adjacent to each other in a plan view are formed in different wiring layers. The wiring line electrode layers adjacent to each other in the same wiring layer are spaced by at least a predetermined distance.

Abstract: An intersecting splitter configured so that the branching ratio of each optical splitter differs in accordance with the difference in the number of intersections in each branched waveguide. The branching ratios (totaling 100%) of the optical splitters are adjusted so that the branching ratios on the high side as to the number of intersections is high in comparison with the branching ratios on the low side as to the number of intersections, and it is thereby possible to level the total loss.

Abstract: An illumination system includes: an illumination device; a time setter that sets a target time; and a controller that controls a color temperature of light emitted by the illumination device. The controller determines a target color temperature according to the target time, and causes the color temperature of the light emitted by the illumination device to be the target color temperature at the target time.

Abstract: An illumination system includes: a seat in a mobile body; a table to be positioned in front of a passenger when the passenger is seated on the seat; a first light source which illuminates the table; and a second light source which illuminates a region closer to the passenger than to the table. When a distance from the first light source to the table is equal to a distance from the second light source to a virtual irradiated surface, an illuminance on the table irradiated by the first light source is lower than an illuminance on the virtual irradiated surface irradiated by the second light source.

Abstract: An optical component includes: a high-relative-refractive-index-difference optical fiber; a single-mode optical fiber fusion-spliced to the high-relative-refractive-index-difference optical fiber, a mode-field diameter of the single-mode optical fiber being greater than a mode-field diameter of the high-relative-refractive-index-difference optical fiber at a wavelength of 1550 nm; and an optical device connected to an end surface of the high-relative-refractive-index-difference optical fiber where the single-mode optical fiber is not fusion-spliced. A total of a connection loss between the high-relative-refractive-index-difference optical fiber and the single-mode optical fiber at the wavelength of 1550 nm and a connection loss between the high-relative-refractive-index-difference optical fiber and the optical device at the wavelength of 1550 nm is less than a connection loss at the wavelength of 1550 nm when the single-mode optical fiber is connected to the optical device directly.

Abstract: An illumination system includes: a seat in a mobile body; a table to be positioned in front of a passenger when the passenger is seated on the seat; a first light source which illuminates the table; and a second light source which illuminates a region closer to the passenger than to the table. When a distance from the first light source to the table is equal to a distance from the second light source to a virtual irradiated surface, an illuminance on the table irradiated by the first light source is lower than an illuminance on the virtual irradiated surface irradiated by the second light source.

Abstract: A device, includes: a touch screen display; and a controller configured to, when the touch screen display detects that a physical body has moved in a predetermined direction while contacting with the touch screen display, cause an object on which a text is inputtable to be displayed on a screen displayed on the touch screen display along a trajectory of the moving.

Abstract: An illumination system includes: a seat; a wall; and a sleep control light for controlling sleep, wherein the seat includes a backrest and a seating portion, and makes a transition between a seated state and a lying state when the backrest and the seating portion make a slide movement, the seated state being a state where a minor angle formed between the backrest and the seating portion is a first angle, the lying state being a state where the minor angle is a second angle greater than the first angle, an optical axis of the sleep control light is tilted downward with respect to the horizontal plane, the sleep control light is located behind or above the seat when the seat is in the seated state, and the optical axis of the sleep control light passes through the backrest when the seat is in the lying state.

Abstract: An intersecting splitter configured so that the branching ratio of each optical splitter differs in accordance with the difference in the number of intersections in each branched waveguide. The branching ratios (totaling 100%) of the optical splitters are adjusted so that the branching ratios on the high side as to the number of intersections is high in comparison with the branching ratios on the low side as to the number of intersections, and it is thereby possible to level the total loss.

Abstract: A cubicle unit includes a first illumination apparatus, a second illumination apparatus, a sensor, and a controller. When a brightness sensed by the sensor is a predetermined brightness or less, the controller causes the second illumination apparatus to emit light having a first color temperature lower than a color temperature of light emitted by the first illumination apparatus. When the brightness sensed by the sensor is greater than the predetermined brightness, the controller causes the second illumination apparatus to emit light having a second color temperature lower than the first color temperature.

Abstract: A lighting device includes: a DC power source circuit; an output control circuit including a chopping switch to adjust an output current by chopping of the chopping switch; light source switches respectively connected to the light sources; and a control unit for controlling a time period for which a current flows in the light sources. The control unit controls the output control circuit such that an operation period for which the chopping is conducted and a stop period for which the chopping is stopped are repeated alternately and performs switchover of the light source switches to be sequentially and selectively turned on, and the switchover is conducted during the stop period with a time interval from a beginning of the stop period.

Abstract: An illumination system includes: a seat; a wall; and a sleep control light for controlling sleep, wherein the seat includes a backrest and a seating portion, and makes a transition between a seated state and a lying state when the backrest and the seating portion make a slide movement, the seated state being a state where a minor angle formed between the backrest and the seating portion is a first angle, the lying state being a state where the minor angle is a second angle greater than the first angle, an optical axis of the sleep control light is tilted downward with respect to the horizontal plane, the sleep control light is located behind or above the seat when the seat is in the seated state, and the optical axis of the sleep control light passes through the backrest when the seat is in the lying state.

Abstract: An optical component includes: a high-relative-refractive-index-difference optical fiber; a single-mode optical fiber fusion-spliced to the high-relative-refractive-index-difference optical fiber, a mode-field diameter of the single-mode optical fiber being greater than a mode-field diameter of the high-relative-refractive-index-difference optical fiber at a wavelength of 1550 nm; and an optical device connected to an end surface of the high-relative-refractive-index-difference optical fiber where the single-mode optical fiber is not fusion-spliced. A total of a connection loss between the high-relative-refractive-index-difference optical fiber and the single-mode optical fiber at the wavelength of 1550 nm and a connection loss between the high-relative-refractive-index-difference optical fiber and the optical device at the wavelength of 1550 nm is less than a connection loss at the wavelength of 1550 nm when the single-mode optical fiber is connected to the optical device directly.

Abstract: The present invention provides a switch device for an optical signal which has high extendibility and which can suppress an increase of loss in extension. A switch device in one embodiment of the present invention includes, in a housing, four splitter portions, four switch portions, and extension splitter portions. The splitter portions are connected to path-side ports, the switch portions are connected to client-side ports, and the splitter portions and the switch portions are connected to one another via shuffle fiber arrays. One ends of the extension splitter portions are connected to path-side extension ports, and the other ends thereof are connected to client-side extension ports. The number of wavelengths processable by the switch device can be easily changed by changing a connection state of optical fibers to the path-side ports, the client-side ports, the path-side extension ports, and the client-side extension ports.

Abstract: A control unit of a light source device after activation time is configured to turn on switches respectively connected in series with light sources, in prescribed order. The light source device and a lighting device are configured to transmit characteristics of the light sources, based on a voltage change depending on a pattern of on and off of the switches.

Abstract: An object of the present invention is to provide a switch unit for optical signals which is capable of reducing an area required for arrangement and reducing manufacturing costs, and a switch apparatus including the switch unit. A switch unit 30 according to one embodiment of the present invention includes two optical switch arrays 34a, 34b arranged to face in opposite directions and in parallel on a substrate. The two optical switch arrays extend along a surface of a chip, and each have four optical switches 31 arranged in parallel. Such a configuration makes it possible to reduce the size of the switch unit because in an excess region of one of the optical switch array, the other optical switch array is disposed.

Abstract: A lighting device includes a power conversion unit, an impedance adjustment unit, a first control unit, and a second control unit. The power conversion unit is configured to convert input power to direct-current power used for a light source. The impedance adjustment unit is formed of a series circuit of a resistor element and a switch element and is coupled to the light source in parallel, relative to the power conversion unit. The second control unit is configured to cause the power conversion unit to operate, for each burst cycle, for an operation period which is not longer than the burst cycle, and increase and reduce the ratio of the operation period to the burst cycle. The first control unit is configured to make the switch element conductive for a predetermined adjustment period which is not longer than the operation period, during the operation period.