Theoretical analysis of tapered fiber microlens parameter and its new fabricating technique

Tapered fiber microlens is widely used to couple the laser light to fiber in communication and material processing. A new technique for making tapered fiber microlens is described. Firstly, one CO2 laser is used as an energy source to heat and taper the fiber pulled by a step motor in the longitudinal direction. Then the tapered fiber is cut into two parts from the middle of fiber by a fiber skiver. Finally, the instrument fiber fusion is used to form the microlens at the end of fiber. Project for measuring coupling efficient, including LD, tapered fiber, optical multi-dimension adjustor devices and power meter, is also presented. In addition, mathematical model of coupling efficiency is studied and analyzed in detailed Compared with the traditional methods, such as etching fiber, grinding fiber and tapering the fiber by burning hydrogen, this method features easy operation, fast fabricating course, stability craft and high coupling efficient.