Optical module

An optical module comprising:

• an optical semiconductor device in which a semiconductor laser and an optical modulator are integrated, the optical semiconductor device including an anode electrode of the semiconductor laser and an anode electrode of the optical modulator, the optical semiconductor device including a cathode electrode common to the semiconductor laser and the optical modulator;
• a bypass capacitor including a lower electrode and an upper electrode, the bypass capacitor being connected in parallel to the semiconductor laser;
• a dielectric substrate having an upper surface and a lower surface, the optical semiconductor device and the bypass capacitor being surface-mounted on the upper surface, the dielectric substrate having a conductor pattern on the upper surface, the cathode electrode and the lower electrode being bonded to the conductor pattern;
• a spacer between the bypass capacitor and the conductor pattern, the spacer electrically connecting the bypass capacitor and the conductor pattern;
• and
• a conductor block supporting the lower surface of the dielectric substrate,
• the conductor pattern including a bonding portion bonded to the cathode electrode, the conductor pattern including a pad bonded to the lower electrode,
• the lower electrode being larger in area than the pad.