Semiconductor laser module.

摘要

A semiconductor laser module is used for transmitting signals by optical fiber in optoelectronic communication. The module comprises a semiconductor laser (1), a lens (2), a receptacle (6) and a lens holder. Reflection beams at an end of a fiber (3) must not return to the semiconductor laser. To deviate the reflection beams from the semiconductor, a key-shaped glass block (10) is mounted in the receptacle. Conventionally the block has been in tight contact with the end of a fiber. Repetition of putting on and taking off ferrules contaminates the glass block. Adhesion of dust deteriorate the performance against noise induced in the laser by the return of the beam. To avoid the adhesion of dust to the surface of the transparent block, the key-shaped transparent block (10) is inserted into an axial hole of the receptacle, separating from the block. A gap between the block and fiber prohibits dust from cohering to the block. The deviation of axes of the receptacle and lens holder is small enough. The assembly is easy. The coupling between the receptacle and lens holder has strong mechanical strength.