Tapered lensed fiber enlarges the numerical aperture of the fiber and increases the light collection capacity, so it is very suitable for coupling with LD, DFB, SLD lasers or VCSELs whose output beam cross-section is circular or approximately circular.

High-precision tapered lensed fiber is also used in the medical laser micro-surgery systems and micro-illumination systems. In addition, the increasingly matured optical fiber waveguide coupling, and silicon integration inevitably uses the tapered lensed fiber to improve coupling efficiency.