Patent ID: 8901478

Claim:
An optical fiber assembly, comprising: a prism comprising an incident surface, an emergent surface, a first reflecting surface, a second reflecting surface, and a third reflecting surface; the incident surface, the emergent surface, the first reflecting surface, the second reflecting surface, and the third reflecting surface sequentially connected to each other; a first collimating portion positioned on the incident surface; a light emitting element facing and aligning with the first collimating portion and configured for emitting light beams; an optical fiber facing and aligning with the emergent surface; and a light detector facing and aligning with the incident surface; wherein the first collimating portion is configured for collimating the light beams into a first light beams and a second light beams parallel to the first light beams, the first light beams are projected to the first reflecting surface, reflected to the emergent surface by the first reflecting surface, and reflected to the optical fiber by the first reflecting surface; the second light beams are projected to the second reflecting surface, reflected to the third reflecting surface by the second reflecting surface, and reflected to the light detector by the third reflecting surface, the light detector is configured for detecting a light intensity of the second light beams, a light intensity of the first light beams is determined by the light intensity of the second light beams and an intensity ratio of the first light beams and the second light beams.