Referring to the invalidity of fused tapering method in fabricating op tical fiber couplers based on special fibers,such as photonic crystal fiber (PCF) and elliptical core polari zation maintaining fiber (ECPMF),a new fabrication method of fused side-adhered (FSA) coupling based on a pair of side-polished fibers is proposed.Numerical model is set up and simulation analysis is performed to optimize the key param eters of side polished fiber,like the remaining thickness in the polished area.Using the proposed method and the optimized parameters,we conduct experiments to fabricate a single mode fiber coupler and characterize its performance.The results show that fiber couplers with various coupling rate from 0% to 90% can be available w ith the FSA method,excess loss and output ports wavelength dependence loss are less than 0.5dB,and 1dB,respec tively,and the coupled port output polarization dependence loss is 0.3dB at wavelength of 1310nm and 0.45dB at 1550nm.This paper demonstrates the feasibility of the FSA method we propose,and supplies theor etical and technical basis in fabricating optical couplers based on special fibers for special requirements.