Numerical analysis of optical coupling characteristics of side-polished photonics crystal fiber and micro optical fiber with bending

In order to design all optical fiber coupling devices based on side-polished photonics crystal fiber(SPPCF) and micro optical fiber(MF), a numerical model was utilized by use of three dimension finite difference beam propagation method (FDBPM). The optical coupling characteristics between SPPCF and MF were calculated and analyzed with the variation of the three factors: residual radius after side polishing, the diameter of the MF, and the radius of curvature of MF´s bending part.The numerical study shows: when the launch light input from MF, the shorter the residual radius of SPPCF is, the larger the optical power, which is coupled into SPPCF. The diameter of the MF and the residual radius after side polishing were also optimized according to the optical transmitted power throught the coupled device by combinning the SPPCF and MF.