Abstract
We proposed an improved polarization control method to reduce polarization-induced phase shift (PIPS)
and polarization-induced fading (PIF) in a dual Mach–Zehnder interferometry (DMZI) disturbance sensing system.
PIPS and PIF will seriously affect the positioning accuracy of the DMZI sensor. This polarization control method uses
two PCs to control the state of polarization at the inputs of clockwise Mach–Zehnder interferometer and
counter-clockwise Mach–Zehnder interferometer, respectively, based on chaotic particle swarm optimization
algorithm, which has advantages of high speed and easy implementation. We experimentally demonstrated that the
polarization method can overcome the effect of PIPS and PIF, improve the positioning accuracy of the DMZI sensor
efficiently with positioning error of ±20 m after polarization control. Compared with the traditional
polarization control method in DMZI based on the criterion of visibility, the positioning error of the sensor using
our proposed method has been reduced at least an order of magnitude.
© 2013 IEEE
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