The present invention relates to a method and system for optically connecting a fiber optic sensor 12 to a light shape sensing console 21. The optical shape sensing console 21 has a number of single optical channels C1, C2, C3. The optical fiber sensor 12 includes a number of single fiber cores A 1, A 2, A 3 spaced at an angle with respect to each other about the longitudinal central axis of the fiber sensor 12 and light connected to the shape sensing console 21. A fiber sensor connecting end 30 connected to the coupler 32； 38. The optical couplers 32； 38 have optical channels C1, C2, C3 arranged to optically connect with the fiber cores A1, A2, A3. A number of single calibration data sets showing the individual optical properties of the single fiber cores A1, A2, A3 are assigned to a single optical channel C1, C2, C3. The fiber sensor connection end 30 is connected to the optical coupler 32 so that the first fiber core A2 of the fiber cores A1, A2, and A3 is in optical communication with the first optical channel C1 among the optical channels C1, C2, and C3. Connected to 38； The optical response of the first fiber core A2 is measured by optical interrogating the first fiber core A2 with the first calibration data set of the calibration data set assigned to the first optical channel C1. Is done. The first fiber core A2 is identified among the fiber cores A1, A2, A3 of the fiber sensor 12 based on the measured optical response of the first fiber core A2 and the calibration data set of the fiber sensor 12. If it is identified that the first fiber core A2 does not match the first calibration data set used to measure the optical response, the calibration data set that matches the identified first fiber core A2 A second calibration data set is reassigned to the first optical channel C1, or a second fiber core A1 that matches the first calibration data set is in optical communication with the first optical channel C1. As such, the fiber sensor connection end 30 and / or t
