Optical transmitter and optical module including the same

An optical transmitter comprising:

• a support substrate;
• a temperature control module disposed on the support substrate;
• a sub-mount disposed on the temperature control module;
• a light receiving element disposed on the temperature control module;
• a prism disposed on the temperature control module and having a sloped surface, the prism being disposed between the light receiving element and the sub-mount;
• a light emitting element disposed on the sub-mount;
• an optical fiber disposed on the sub-mount and in optical communication with the prism;
• and
• a thermistor disposed on the sub-mount,
• wherein:
• the light receiving element is disposed separately from the sub-mount in a first direction and is disposed adjacent to the prism on the temperature control module,
• a first portion of light emitted from the light emitting element is reflected by the sloped surface of the prism and emitted through a lens,
• a second portion of the light passes through the prism and is received by the light receiving element in such a way that a light output from the light emitting element is directly monitored by the light receiving element, and
• the sloped surface of the prism is angled such that a light coupling efficiency between the emitted light and the optical fiber is increased.