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Imperfect quarter-waveplate compensation in Sagnac interferometer-type current sensors

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4 Author(s)
Short, S.X. ; Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA ; Tselikov, A.A. ; de Arruda, J.U. ; Blake, J.N.

We analyze scale factor errors associated with integrating imperfect quarter-waveplates into loop and in-line Sagnac interferometer fiber-optic current sensors. We show that relatively large imperfections in the quarter-waveplates can be tolerated in the loop version when the birefringence axes of the two quarter-waveplates are oriented 45° with respect to each other. For the in-line version, we demonstrate an electronic signal processing scheme that desensitizes the scale factor to imperfections in the quarter-waveplate

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Lightwave Technology, Journal of  (Volume:16 ,  Issue: 7 )