Optical transmission device and optical module

An optical transmission device comprising:

• an optical transmission member that transmits an optical signal;
• an optical receiver package that includes a plurality of terminals that are exposed to an outside from a front surface thereof and projecting portions that bulge out laterally from a side surfaces thereof, receives the optical signal transmitted through the optical transmission member to convert the optical signal into electrical signals, and outputs the electrical signals from the terminals;
• and
• a flexible board that includes:
• an electrode arrangement part on which electrodes respectively connected to the terminals are arranged side by side to transmit the electrical signals from the terminals;
• and
• a pair of arm parts that project more outward than an electrode located on an end of the electrode arrangement part and extend along the side surfaces of the optical receiver package to sandwich the optical receiver package, each of the arm parts including a concave part to be hooked to one of the projecting portions of the optical receiver package.

An optical module comprising:

• an optical modulation package that includes a plurality of terminals that are exposed to an outside from a front surface thereof and projecting portions that bulge out laterally from side surfaces thereof, and performs optical modulation on electrical signals input from the terminals;
• a flexible board that includes:
• an electrode arrangement part on which electrodes respectively connected to the terminals are arranged side by side to transmit the electrical signals to the terminals;
• and
• a pair of arm parts that project more outward than an electrode located on an end of the electrode arrangement part and extend along side surfaces of the optical modulation package to sandwich the optical modulation package, each of the arm parts including a concave part to be hooked to one of the projecting portions of the optical modulation package.