Abstract: A laser diode package according to the present disclosure includes a packaging housing unit and a coolant housing unit, wherein the coolant housing unit is coupled to the packaging housing unit, includes a coolant inlet through which coolant is introduced and a coolant outlet through which the coolant is discharged, and has a coolant flow path therein, and laser light source units disposed on a base of the packaging housing unit and each including a laser diode configured to emit a laser beam, wherein the laser light source unit includes a cooler coupled to the base, including a coolant channel connected to the coolant flow path of the coolant housing unit, and having at least an upper surface made of a metal layer, and a submount bonding-coupled to the upper surface of the cooler and having an upper surface to which the laser diode is bonding-coupled.

Abstract: An optical transmitter and an optical module including the optical transmitter are provided. The optical transmitter may include a support substrate, a temperature control module disposed on the support substrate, a sub-mount disposed on the temperature control module, a prism disposed on the temperature control module and having a sloped surface, a light receiving element disposed on the temperature control module, a light emitting element disposed on the sub-mount, and a thermistor disposed on the sub-mount. The light receiving element may be disposed separately from the sub-mount in a first direction, and the prism may be disposed between the light receiving element and the sub-mount. Some first light emitted from the light emitting element may be reflected by the sloped surface of the prism, and some of the first light may pass through the prism and be received by the light receiving element.

Abstract: An optical transmitter and an optical module including the optical transmitter are provided. The optical transmitter may include a support substrate, a temperature control module disposed on the support substrate, a sub-mount disposed on the temperature control module, a prism disposed on the temperature control module and having a sloped surface, a light receiving element disposed on the temperature control module, a light emitting element disposed on the sub-mount, and a thermistor disposed on the sub-mount. The light receiving element may be disposed separately from the sub-mount in a first direction, and the prism may be disposed between the light receiving element and the sub-mount. Some first light emitted from the light emitting element may be reflected by the sloped surface of the prism, and some of the first light may pass through the prism and be received by the light receiving element.