A Special Long Beat Length Crystal Circular Polarization Maintaining Optical Fibre Sensing Ring
Q. Tao and D-M. Peng
In this paper, a special long beat length crystal circular polarization maintaining optical fibre (CPMOF) sensing ring is researched. The evolution of state of polarization (SOP) along special long beat length CPMOF is calculated by Jones vector method. Power and phase difference variation along fast axis and slow axis of special long beat length CPMOF are obtained. Also, output polarization states of end cross-section of special long beat length CPMOF are obtained. When the optical fibre is wound into a ring to test for full optical current transformer system (FOCTS), testing results show ratio errors can meet national standards. Special long beat length CPMOF sensing ring can be best applied to FOCTS.
Keywords: Long beat length, circular polarization maintaining optical fibre (CPMOF), full optical current transformer system (FOCTS), spun fibre, rotational rate, ratio error, Jones vector method