Abstract: An optical transmitter has a case. The case houses a laser beam generator, a lens, a cooler, and a high heat conductivity member. The lens concentrates the laser beam generated by the laser beam generator and leads the laser beam to an optical fiber. The high heat conductivity member is arranged between the laser beam generator and the lens and the cooler. The laser beam generator has higher heat conductivity than that of the case. The laser beam generator conveys the heat generated in the laser beam generator to the cooler.

Abstract: An optical transmitter has a case. The case houses a laser beam generator, a lens, a cooler, and a high heat conductivity member. The lens concentrates the laser beam generated by the laser beam generator and leads the laser beam to an optical fiber. The high heat conductivity member is arranged between the laser beam generator and the lens and the cooler. The laser beam generator has higher heat conductivity than that of the case. The laser beam generator conveys the heat generated in the laser beam generator to the cooler.

Abstract: An optical module includes a heat sink, a cooling device provided on the heat sink, an optical semiconductor device provided on the cooling device, a frame provided on the heat sink adjacent to the cooling device and the optical semiconductor device, an optical system held on the frame in an optical coupling with the optical semiconductor device, and a cover member provided on the frame so as to define a hermetically sealed enclosure together with the frame and the heat sink, wherein the optical semiconductor device and the cooling device are accommodated in the hermetically sealed enclosure, and wherein at least a part of the frame carrying the optical system is formed of a material identical with a material forming the heat sink. Thereby, the part forms an integral, continuous extension of the heat sink.

Abstract: An optical module in which light emitted from a light emitting element fixed to a substrate is made incident on an optical fiber through an optical lens, including a lens holder which immovably supports the optical lens, and a lens holder guide fixed to the substrate to support the lens holder. The invention is also directed to a method of manufacturing an optical module including moving the holder guide and the lens holder on the substrate and in the lens holder guide, in orthogonal x-y directions and in a z-direction perpendicular to the x-y directions, respectively, to adjust the position of the lens, so that the light emitted from the light emitting element is incident on the optical fiber, and then fixing the lens holder guide and the lens holder to the substrate and the lens holder guide, respectively.