An optical fiber connection unit able to efficiently remove heat generated in the optical fiber connection unit. The optical fiber connection unit includes a closed circulation path, through which coolant for eliminating heat generated in the optical fiber connection unit by a laser beam propagating through the optical fiber connection unit circulates, and a coolant circulation device for causing the coolant to flow and circulate in the circulation path.

The present invention relates to a wavelength-tunable laser, which can tune an oscillating laser wavelength and can be manufactured in a small size, comprising: a laser diode chip (100) for emitting a laser beam; a partial reflection mirror (500) for optical feedback, which partially reflects the beam emitted from the laser diode chip (100) so as to enable the reflected beam to be fed back to the laser diode chip (100); a collimation lens (200) provided on an optical path between the laser diode chip (100) and the partial reflection mirror (500) for optical feedback so as to collimate the beam emitted from the laser diode chip (100); a wavelength-tunable selective filter (300) for converting the wavelength transmitted according to the temperature; a phase compensator (350) of which a refractive index is changed according to the temperature and which offsets a change in the refractive index according to the temperature of the semiconductor laser diode chip (100) or the wavelength-tunable selective filter (300); and a 45 degree reflection mirror (400) for switching the direction of the laser beam from the laser beam traveling in the horizontal direction with respect to a bottom surface of a package, to the laser beam traveling in the vertical direction with respect to the bottom surface of the package, wherein the laser diode chip (100), the wavelength-tunable selective filter (300), and the phase compensator (350) are disposed at an upper part of a thermoelectric element (900) so as to change the wavelength oscillating according to a change in the temperature of the thermoelectric element (900).

Provided is a laser system that includes a laser head having a laser holder configured to house a laser beam and a lens for reflecting the laser beam at a predetermined wavelength, and a thermal-mechanical adjustment device disposed on the laser head and configured to adjust a temperature and an alignment of the laser beam, to maintain the predetermined wavelength of the laser beam.

Provided is a tunable wavelength laser module including: an external cavity type light source generating broadband light; an optical waveguide; a Bragg grating formed in the optical waveguide; a heater provided above the optical waveguide in which the Bragg grating is formed and adjusting a reflection band of the Bragg grating by a thermo-optic effect; a direction change waveguide region changing direction of optical signals obtained by the adjusted reflection band of the Bragg grating, by a predetermined angle; a 45-degree reflection part transmitting some of the optical signals direction-changed by the direction change waveguide region and escaping from the optical waveguide therethrough and reflecting the others of the optical signals in a vertical upward direction thereby; and a lens making the optical signals reflected in the vertical upward direction by the 45-degree reflection part collimated light or convergent light.

An optical system includes a laser cavity on a base. The laser cavity generates a light signal in response to application of an electrical current to the laser cavity. The system includes first electronics that apply a target level of the electrical current to the laser cavity so as to cause the laser cavity to generate the light signal. The light signal experiences mode hops at electrical current levels that shift to higher current levels in response to increasing laser operation times. A first one of the mode hops occurs at a first current level and a second one of the mode hops occurs at a second current level that is higher than the first current level. The system also includes a phase shifter that interacts with the laser cavity so as to shift the mode hops to lower current levels than occur in the absence of the phase shifter.

An external resonator type laser device has an optical element that forms an external resonator with a semiconductor device by selecting and reflecting light of a specific wavelength range from light outputted from the semiconductor device; a supporting member formed of a material having a larger coefficient of linear expansion than the optical element; and a first mount interposed between the optical element and the supporting member, formed of a material having a coefficient of linear expansion closer to that of the optical element compared with that of the supporting member. The optical element is adhered to the first mount. The first mount is adhered to the supporting member by an adhesive having a Shore hardness of less than or equal to 65.

A superluminescent diode and a method for implementing the same, wherein the method includes growing a first epi layer on top of an SI (semi-insulating substrate); re-growing a butt based on the first epi layer; forming a tapered SSC (spot size converter) on the re-grown butt layer; forming an optical waveguide on an active area that is based on the first epi layer and on an SSC area that is based on the tapered SSC; forming an RWG on the optical waveguide; and forming a p-type electrode and an n-type electrode.

An apparatus for cooling electronic circuitry components and photonic components. In examples of the disclosure at least one photonic component is positioned overlaying at least one electronic circuitry component. In examples of the disclosure there is also provided a spacer for spacing the at least one electronic circuitry component and the at least one photonic component, wherein the spacer for spacing are thermally insulating. In examples of the disclosure there is also provided a first heat transfer configured to remove heat from the at least one electronic circuitry component, and a second heat transfer configured to remove heat from the at least one photonic component.

A light emitting device includes a first substrate, a light source on a first surface of the first substrate and that emits light toward an object, and a driver disposed in the first substrate and that drives the light source. The driver overlaps the light source in a plan view. The light emitting device includes at least one first via disposed in the first substrate and overlapping the driver in the plan view, and a first conductor on a second surface of the first substrate opposite the first surface and overlapping the light source, the driver, and the at least one first via in the plan view. The first conductor is connected to the at least one first via.

An external resonator-type laser having a narrow line width according to the present disclosure includes a gain chip having a laser gain, a lens for collimating light emitted from the gain chip into parallel light, and a wavelength selective filter for transmitting light having a specific wavelength among the light collimated through the lens, wherein two-sided heat transfer members disposed on at least one side of at least one of the lens and the wavelength selective filter and made of a material having a higher heat transfer rate than the lens and the wavelength selective filter, are included.