OPTIMAL-DESIGN OF IRIS-BASED POLARIMETRIC INTRINSIC FIBER OPTIC CURRENT SENSORS

Performance of reciprocity-compensated polarimetric fiber optic curren t sensors are analyzed for typical low-birefringence fibers, The inten sity-based reciprocity-insensitive structure (IRIS) can effectively ba lance the birefringent and lossy influences in intrinsically low-biref ringence fiber-based current sensors, while supplementary techniques s uch as wavelength control and pole-zero cancellation are needed to eli minate the strong polarization coupling effect in spun fiber-based sen sors. It is shown from simulation that the stability of the sensor can be maximized by using the IRIS and a suitable initial birefringence.