Patent ID: 7198412

Claim:
A holder of optical transmission lines, comprising: an insulating base body defined by a mounting face configured to mount an optical device chip, an opposing face opposing to the mounting face and a plurality of side faces which connect between the mounting face and the opposing face, one of side faces is assigned as an interconnection face, and provided with a plurality of through-holes penetrating between the mounting face and the opposing face so as to hold a plurality of optical transmission lines, the through-holes define a plurality of openings on the mounting face by intersecting the mounting face; a plurality of electric interconnections extending from respective vicinities of the openings on the mounting face on to the interconnection face; and a plurality of heat conduction passages assigned alternately with the electric interconnections, extending from the mounting face on to the interconnection face, each of the heat conduction passages has a length longer than the length of the electric interconnections on the interconnection face.