Abstract:
A method is provided to provide surface-emitting type semiconductor lasers and methods for manufacturing the same, which can readily control transverse modes of laser light. A surface-emitting type semiconductor laser pertains to a surface-emitting type semiconductor laser having a vertical resonator above a substrate. The vertical resonator includes a first mirror, an active layer and a second mirror disposed in this order from the substrate, and is equipped with an optical path adjusting layer having a concave curved surface over the second mirror.
Abstract:
To provide surface-emitting type semiconductor lasers and methods of manufacturing the same in which the polarization direction of laser light can be readily controlled, a surface-emitting type semiconductor laser includes a vertical resonator above a substrate. The vertical resonator includes a first mirror, an active layer and a second mirror disposed in this order from the substrate. The vertical resonator has a plurality of unit resonators. An emission region of each of the unit resonators has a diameter that oscillates in a single-mode.
Abstract:
To provide surface-emitting type semiconductor lasers and methods of manufacturing the same in which the polarization direction of laser light can be readily controlled, a surface-emitting type semiconductor laser includes a vertical resonator above a substrate. The vertical resonator includes a first mirror, an active layer and a second mirror disposed in this order from the substrate. The vertical resonator has a plurality of unit resonators. An emission region of each of the unit resonators has a diameter that oscillates in a single-mode.
Abstract:
A surface-emitting type semiconductor laser includes a substrate; a first mirror disposed above the substrate; an active layer disposed above the first mirror; a second mirror disposed above the active layer; a first columnar section including the active layer, the first columnar section not having anisotropy; a first dielectric layer disposed in the first columnar section, the first dielectric layer including a symmetric opening section; a second columnar section disposed above the first columnar section, the second columnar section having an outer wall that has anisotropy; and a second dielectric layer disposed in the second columnar section, the second dielectric layer including an asymmetric opening section.
Abstract:
A reliable surface-emitting type semiconductor laser and a method for manufacturing the same, is capable of controlling polarization planes of laser light without lowering the energy usage efficiency. The surface-emitting type semiconductor laser has a first mirror, an active layer and a second mirror formed above a substrate, a first columnar section formed adjacent to the active layer and including a dielectric layer defining an opening section and a second columnar section formed above the first columnar section. A planar configuration of the second columnar section has anisotropy.
Abstract:
To provide surface-emitting type semiconductor lasers and methods of manufacturing the same in which the polarization direction of laser light can be readily controlled, a surface-emitting type semiconductor laser includes a vertical resonator above a substrate. The vertical resonator includes a first mirror, an active layer and a second mirror disposed in this order from the substrate. The vertical resonator has a plurality of unit resonators. An emission region of each of the unit resonators has a diameter that oscillates in a single-mode.
Abstract:
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.
Abstract:
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.
Abstract:
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.
Abstract:
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.