A study on insertion loss improvement for an optical connector using the analysis of transmitted optical intensity

In one of the proposed methods for single-mode fiber connection the technique for stepwise orientation of the ferrule is used to reduce the transverse offset between butt-joint fiber cores by achieving the minimizing loss region (MLR). This method requires several stepwise rotations to make the fiber core within the MLR, which is determined by the optimal tradeoff between insertion loss and working time. In this method the insertion loss severely depends on the size of the predetermined MLR. A new assembly method through which a very small MLR can be achieved in a short time is proposed. With this method, performance can be in proved by minimizing misalignment offset of components without any requirement of strict tolerances. The eccentricity between the cladding and the core, which is classified as an intrinsic misalgnment factor, can be overcome. The rotating ferrule adjustment method, by using an adaptive control algorithm, makes the optimal peak intensity point fall into the very narrow MLR with just one try. Lower coupling loss can be achieved by aligning the peak intensity point in a very narrow region of the sleeve. An automated termination process can be setup, using a computer that performs both the power intensity distribution image process and orientation adjustment