The Effect of the Broken Edge on the Concentricity of the Micro-Polished Optical Fiber End-Face

Abstract

The concentricity of the optical fiber micro lens affects the coupling efficiency of a laser module a lot. In this paper, the effect of the perpendicularity of the broken edge on the concentricity of the micro optical fiber end-face during the micro polishing process is studied. A mathematical model is derived to describe the variation of the material removal rate (MRR) when the tilt angles and amount of feed of the optical fiber are changed. An experiment is built to measure the concentricity of optical fiber with different tilt angles and feeds. The result shows that both of the dimensionless factor QAB and measured concentricity have the same tendency. The concentricity is better when the tilt angle is smaller and the amount of feed is larger. An improved polishing process is suggested. A good concentricity within 1μm can be achieved when fabricate the double-variable curvatures end-face of the optical fiber.