Design and Fabrication of Aspheric Bi-Convex Microlens to Maximize Optical Fiber Coupling Efficiency

  • 霍 克

學生論文: Master's Thesis

摘要

This thesis presents a method to maximize the coupling efficiency between optical fiber and edge emitting type laser diode (LD) by means of an asphirical bi-convex microlens The proposed microlens is fabricated using an excimer laser dragging method and has four different profiles in the x- and y-axis directions The focus spot size of the beam and coupling efficiency of the LD to optical fiber is examined both numerically and experimentally The results suggest that with an appropriate experimental setup the focused spot size of the elliptically diverging beam is minimized which will contribute to increase coupling efficiency of optical fiber The feasibility of proposed approach can be used for beam pen lithography laser scanning laser lithography optical fiber telecommunication MEMS technology optoelectronics In this thesis the coupling efficiency of the LD to optical fiber is examined both numerically and experimentally Firstly a model has been demonstrated for LD characteristics and beam propagation and then optimized a lens profile to achieve diffraction limited spot size with ray tracing software Zemax Polynomial sag height function were chosen to design biconvex microlens Based on simulated result the coefficients of polynomial profile function for double-convex microlens are found The excimer laser dragging method is then used to fabricate the double-convex microlens By this method desired surface profile of the microlens is achieved with better surface roughness The microlens is then easily assembled with laser diode by simple optical tap without any holder or collimating tube which will reduce assembly cost Finally using this assembly LD beam is focused into optical fiber and measure the output power
獎項日期2015 十二月 24
原文English
監督員Yung-Chun Lee (Supervisor)

引用此文

Design and Fabrication of Aspheric Bi-Convex Microlens to Maximize Optical Fiber Coupling Efficiency
克, 霍. (Author). 2015 十二月 24

學生論文: Master's Thesis