Optical transmission module and optical module

An optical transmission module comprising:

• a housing;
• one or more substrates that are laminated and housed inside the housing in such a way as to be partially exposed;
• a light emitter that is housed in the housing and generates an optical signal;
• an optical functional element that is housed in the housing and executes signal processing on a transmission signal that drives the light emitter;
• a plurality of terminals provided on the one or more substrates in such a way as to extend between an outside and an inside of the housing;
• a plurality of external terminals disposed outside the housing from among the plurality of terminals;
• and
• a plurality of internal terminals disposed inside the housing from among the plurality of terminals, wherein
• a first group of the plurality of internal terminals is a first internal terminal connected to an electrode of a high-frequency circuit of the optical functional element,
• a second group of the plurality of internal terminals is a second internal terminal connected to an electrode of a low-frequency circuit of the optical functional element, and,
• in a direction perpendicular to a major surface of the one or more substrates, a length between an upper surface of the electrode of the high-frequency circuit and an upper surface of the first internal terminal is less than a length between an upper surface of the electrode of the low-frequency circuit and an upper surface of the second internal terminal.