Abstract: Methods of assembling and testing an optical coherent receiver are disclosed. The method includes steps of, preparing a test beam by combining a first test beam and a second test beam each having respective polarizations orthogonal to each other, entering the test beam accompanied with a third test beam, and aligning a polarization beam splitter (PBS) that splits the test beam depending on the polarizations thereof and a beam splitter (BS) that split the third test beam. A feature of the methods are that the alignment of the PBS and the BS and the monitor of outputs therefrom are concurrently carrier out for two multi-mode interference (MMI) devices.

Abstract: A laser device includes: an optical modulator that is optically coupled to a semiconductor laser mounted on a first mounting portion; a second mounting portion that is separately away from the first mounting portion; a bridge that couples the first mounting portion and the second mounting portion; a driver IC that is mounted on the second mounting portion and drives the optical modulator through a transmission pathway provided on the bridge; and a capacitor that is provided on the bridge and is coupled to the transmission pathway.

Abstract: An electronic component includes an electronic element, a conductive first base portion, a conductive second base portion, an insulator and a terminal. An electronic element is to be mounted on the electronic element mounting portion. The electronic element mounting portion is mounted on the first base portion. The insulator insulates the first base portion from the second base portion and couples the first base portion to the second base portion. The terminal is provided on the first base portion and is insulated from the first base portion.

Abstract: An optical module has a package, a first fixing portion, a second fixing portion, and two attachment portions. The package has an optical fiber passing through a sidewall thereof. The first fixing portion fixes the optical fiber to the sidewall of the package directly or indirectly through an intermediate member. The second fixing portion fixes the optical fiber inside of the package. The two attachment portions are arranged respectively at two opposing corners of the package or at two sides of the package around the corners. A distance between the first fixing portion and the second fixing portion is less than 6 mm.

Abstract: An electronic component includes an electronic element, a conductive first base portion, a conductive second base portion, an insulator and a terminal. An electronic element is to be mounted on the electronic element mounting portion. The electronic element mounting portion is mounted on the first base portion. The insulator insulates the first base portion from the second base portion and couples the first base portion to the second base portion. The terminal is provided on the first base portion and is insulated from the first base portion.

Abstract: An optical module has a package, a first fixing portion, a second fixing portion, and two attachment portions. The package has an optical fiber passing through a sidewall thereof. The first fixing portion fixes the optical fiber to the sidewall of the package directly or indirectly through an intermediate member. The second fixing portion fixes the optical fiber inside of the package. The two attachment portions are arranged respectively at two opposing corners of the package or at two sides of the package around the corners. A distance between the first fixing portion and the second fixing portion is less than 6 mm.