Optical module and optical transmission device

An optical transmission device comprising:

• an optical transmission member that transmits an optical signal;
• a substrate on which an electrode is arranged;
• a package including:
• a housing fixed to the substrate;
• a receiving unit that optically demodulates the optical signal received from the optical transmission member to convert the optical signal into a reception electrical signal;
• a plurality of output terminals that are provided on a surface of the housing and that output the reception electrical signal obtained by the receiving unit;
• an input terminal that is provided at a height from the substrate different from a height of the output terminals and at a position overlapping with an arrangement range of the output terminals in a direction parallel to a surface of the substrate, and that receives a transmission electrical signal;
• and
• a transmitting unit that optically modulates the transmission electrical signal received from the input terminal and transmits an optical signal resulting from optical modulation to the optical transmission member;
• and
• a flexible substrate having flexibility and including a signal electrode that connects a first terminal of the output terminals and the input terminal to the electrode arranged on the substrate.