elliptical polarization state, the direction of the electric field
changes during the light propagation. The end of the
electric field vector forms an elliptical shape; hence, it is
called ‘‘elliptical polarized light”.
The refractive index of a fiber changes when it undergoes
stress or strain. Thus, there is an induced phase difference
between different polarization directions. This
phenomenon is called photoelastic effect. Moreover, the
refractive index of a fiber undergoing a certain stress or
strain is called induced refractive index. The induced
refractive index changes with the direction of applied
stress or strain. Thus, there is an induced phase difference
between different polarization directions. In other words,
under the external perturbation, such as stress or strain,
the optical fiber works like a linear retarder. Therefore, by
detecting the change in the output polarization state, the
external perturbation can be sensed [10]
elliptical polarization state, the direction of the electric fieldchanges during the light propagation. The end of theelectric field vector forms an elliptical shape; hence, it iscalled ‘‘elliptical polarized light”.The refractive index of a fiber changes when it undergoesstress or strain. Thus, there is an induced phase differencebetween different polarization directions. Thisphenomenon is called photoelastic effect. Moreover, therefractive index of a fiber undergoing a certain stress orstrain is called induced refractive index. The inducedrefractive index changes with the direction of appliedstress or strain. Thus, there is an induced phase differencebetween different polarization directions. In other words,under the external perturbation, such as stress or strain,the optical fiber works like a linear retarder. Therefore, bydetecting the change in the output polarization state, theexternal perturbation can be sensed [10]
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