A technique for completely measuring the inconsistency between the two branches of a Y-junction in static and dynamic temperature is proposed.

The characteristic parameters of two branches of a Y-junction can be calibrated accurately.

Optical path tracking method for simplifying the analysis of polarization light transmission in Y-junction and PMFs is presented.

The proposed technique provides an efficient and conducive way for real-time monitoring and selecting qualified Y-junctions in IFOG applications.