Patent ID: 6877911

Claim:
An optical-fiber supporting member coupled to a light emitting element so as to constitute an optical transmission device, wherein an optical-transmission light emitting portion for outputting light that enters an optical fiber, and a reference-light emitting portion for outputting reference light that does not enter said optical fiber are formed on a same side of said light emitting element, said optical-fiber supporting member includes a through hole in which an end portion of said optical fiber is inserted, and a photodetector for detecting light from said reference-light emitting portion, said photodetector is disposed on a side opposing said side of said light emitting element, said through hole extends perpendicularly to said side, a positional relationship between a center of a cross-section of said through hole and a reference point of said photodetector is determined corresponding to a positional relationship between said optical-transmission light emitting portion and said reference-light emitting portion of said light emitting element, and an optical axis of the optical-transmission light emitting portion for outputting light is aligned with an axis of the through hole within an offset by a predetermined amount, the axis of the through hole passing the center of the through hole.