Abstract
Optical current sensors are demonstrated based on polarization rotated
reflection interferometry by incorporating polymeric optical waveguide
components. Polarization maintaining 3-dB couplers, TE-pass waveguide
polarizers, and thermo-optic phase modulators are designed and fabricated in
this work in order to provide essential building blocks for constructing the
current sensors. The phase difference between the two circularly polarized
waves imposed by the Faraday effect of the optical fiber is detected using
the interferometric optical sensor consisting of the polymeric components.
To remove the bending induced birefringence, the optical fiber wound around
a ceramic frame is annealed at 850$^{\circ}$C for 24 hours. The reflection interferometer comprising the
polymer waveguide components operates with good linearity proportional to
the monitoring current.
© 2010 IEEE
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