Patent ID: 8475058

Claim:
An optical module, comprising: a semiconductor optical device to emit signal light, said semiconductor optical device providing an optical axis; a thermo-electric cooler that mounts said semiconductor optical device thereon to control a temperature of said semiconductor optical device; a mirror and a carrier for mounting said mirror thereon, said carrier being mounted on said thermo-electric cooler; and a multi-layered ceramic package for installing said semiconductor optical device and said thermo-electric cooler therein, said ceramic package including a bottom and a lid, said bottom extending substantially in parallel to said optical axis and said mirror reflective of said signal light toward a direction perpendicular to said bottom, said lid having a cylinder, a ceiling and a hollow in a position corresponding to said cylinder, said hollow forming a portion in said lid with a thickness thereof thinner than a thickness of said cylinder and said ceiling, and wherein said cylinder of said lid assembles an optical coupling member to couple said signal light emitted from said semiconductor optical device and reflected by said mirror externally from said multi-layered ceramic package, and said ceiling of said lid in a periphery thereof is welded to a seal ring provided in a top of ceramic layers of said multi-layered ceramic package.