Optical module

An optical module comprising a plate-like metal stem in which a metallic lead pin is inserted in a through-hole so as to be coaxial with the through-hole and one sheet of a dielectric substrate which is equipped with a high-frequency signal line to be connected to the lead pin and a semiconductor optical integrated element, in which a semiconductor laser and an optical modulator are integrated, and which is connected to the high-frequency signal line with a bonding wire, wherein

• one side surface of the dielectric substrate extends in a direction perpendicular to the light axis direction of the semiconductor optical integrated element, and the one side surface of the dielectric substrate is arranged in contact with a surface of the metal stem,
• on at least one part of the one side surface, an electrode which is common to a cathode electrode of the high-frequency signal line is formed and the electrode and a surface of the metal stem are electrically connected, and
• the semiconductor optical integrated element has a back surface of optical output which is at a side of the metal stem, and an optical detector which detects light which leaks to the back surface of the semiconductor optical integrated element is provided on a surface of the metal stem.

An optical module comprising a plate-like metal stem in which a metallic lead pin is inserted in a through-hole so as to be coaxial with the through-hole and one sheet of a dielectric substrate which is equipped with a high-frequency signal line to be connected to the lead pin and a semiconductor optical integrated element, in which a semiconductor laser and an optical modulator are integrated, and which is connected to the high-frequency signal line with a bonding wire, wherein

• one side surface of the dielectric substrate extends in a direction perpendicular to the light axis direction of the semiconductor optical integrated element, and the one side surface of the dielectric substrate is arranged in contact with a surface of the metal stem,
• on at least one part of the one side surface, an electrode which is common to a cathode electrode of the high-frequency signal line is formed and the electrode and a surface of the metal stem are electrically connected, and
• the semiconductor optical integrated element has a back surface of optical output which is at a side of the metal stem, and an optical detector which detects light which leaks to the back surface of the semiconductor optical integrated element is provided on the dielectric substrate.