摘要:
The invention provides an optical module, in which a surface-emitting laser and an optical fiber are coupled, with the optical axes thereof crossed at a predetermined angle, at low cost. A supporting member supports the end of an optical fiber, in which the extending direction of a through hole and a face at the optical fiber end are orthogonal to each other. A surface-emitting laser and the supporting member are coupled by metal projections having different heights, so that a light-emitting face of the surface-emitting laser and the face of the supporting member are disposed so as to be opposed to each other at a predetermined angle. After the projections are formed on an electrode and metal patterns on the surface of the surface-emitting laser by a method based on wire bonding, the leading ends thereof are fixed to metal patterns of the supporting member by ultrasonic welding.
摘要:
In a optical transmission device in which a surface-emitting laser and an optical fiber are coupled, a light emitting portion of the surface-emitting laser and an input end of the optical fiber are positioned with high precision. An optical-fiber supporting member is provided with an optical-fiber through hole in which an end portion of an optical fiber is inserted, and a photodiode. The through hole and the photodiode are arranged corresponding to the arrangement of two light emitting portions of a surface-emitting laser so that a center of the circular section of the through hole and the optical axis of the optical-transmission light emitting portion are off set by a predetermined amount when a center point of the photodiode and the optical axis of the reference-light emitting portion are aligned. The surface-emitting laser and the optical-fiber supporting member are coupled with the center point of the photodiode and the optical axis of the reference-light emitting portion aligned with each other.
摘要:
The invention provides a display device whose size and resolution can easily be increased. Signal transmission lines, from signal control circuits to data electrode driving circuits, are optical waveguides serving as optical transmission lines capable of transmitting optical signals. Signal transmission lines, from the signal control circuits to address electrode driving circuits, are also optical waveguides serving as optical transmission lines capable of transmitting optical signals.
摘要:
The present invention provides a surface emitting laser and a photodiode which permit secure mounting even in mounting by flip chip bonding, and high-speed modulation. The present invention also provides a manufacturing method therefor and an optoelectric integrated circuit using the surface emitting laser and the photodiode. Semiconductor stacked layers stacked on a semiconductor substrate have a light emitting portion and a reinforcing portion formed with a recessed portion provided therebetween, and a p-type ohmic electrode and an n-type ohmic electrode are formed on the top of the reinforcing portion. The p-type ohmic electrode is electrically connected to a p-type contact layer through a contact hole vertically formed in polyimide buried in the recessed portion to permit supply of a current to the light emitting portion in the thickness direction. The recessed portion has a groove formed to reach the semiconductor substrate, thereby suppressing the parasitic capacity between the p-type ohmic electrode and the n-type ohmic electrode.
摘要:
This invention provides an optical transmitter in which reduced power consumption is achieved by, when a signal generator needs data transmission, driving a laser emitting device to perform emission. An optical transmitter includes a receiver, a laser driving circuit, a light emitting unit constituted by a plurality of laser emitting devices, and an EDID memory. The receiver and the laser driving circuit are supplied with power from a dedicated external power supply through a power-supply line, and the power-supply line is provided with a switch. The contact of the switch is controlled to open and close based on a power-supply voltage supplied from the DDC controller to the EDID memory.
摘要:
The invention provides an optical transceiver which makes it possible to simplify a production process. An optical transceiver of the present invention includes an optical socket to mount an optical plug disposed at one end portion of an optical fiber); a light-condensing device; and an optical element to emit light in accordance with a supplied electrical signal and an optical element to generate an electrical signal in accordance with a received light signal; and a light-transmissive substrate to support the optical socket, the light-condensing device, and the optical elements so that the optical fiber, the light-condensing device, and the optical elements are aligned on an optical axis of the optical transceiver.
摘要:
A light emitting element driving circuit drives a surface-emitting element, and the light emitting element driving circuit is equipped with a bias current driving circuit that supplies a generally constant bias current to the surface-emitting element, a modulation current driving circuit that supplies to the surface-emitting element a modulation current superimposed on the bias current, and a temperature detection circuit that detects the temperature of the surface-emitting element, wherein the modulation current driving circuit decreases the current amount of the modulation current, when the temperature detected rises. The bias current driving circuit may preferably supply the bias current to the surface-emitting element through a coil, and the modulation current driving circuit may preferably supply the modulation current to the surface-emitting element through a capacitor.
摘要:
A light emitting element driving circuit drives a surface-emitting element, and the light emitting element driving circuit is equipped with a bias current driving circuit that supplies a generally constant bias current to the surface-emitting element, a modulation current driving circuit that supplies to the surface-emitting element a modulation current superimposed on the bias current, and a temperature detection circuit that detects the temperature of the surface-emitting element, wherein the modulation current driving circuit decreases the current amount of the modulation current, when the temperature detected rises. The bias current driving circuit may preferably supply the bias current to the surface-emitting element through a coil, and the modulation current driving circuit may preferably supply the modulation current to the surface-emitting element through a capacitor.
摘要:
A sensor device includes a mounting member having fixation surfaces inside, and at least one electronic component directly or indirectly fixed to the fixation surfaces of the mounting member, and the mounting member constitutes a part of a casing for housing the electronic component. Further, the fixation surfaces are perpendicular to each other.
摘要:
Based on binary transmission data 12, a receiver 11 emits electromagnetic waves 13 with modulated plane of polarization into a free space 16. The data propagates along the free space 16 as the azimuth of the plane of polarization. A receiver 17 accepts the electromagnetic wave 13 with modulated plane of polarization discriminates the data based on the state of the plane of polarization, and outputs the binary received data 18. The data and the clock data are transmitted from a plurality of light-emitting units with different polarization states or wavelengths to omit PLL circuits.