Abstract
A large fraction of fiber-optic-sensor systems make use of interferometry in the measurement process, implying
the need for demodulation to obtain the encoded signal of interest. Of great interest for sensor characterization is
the performance of the demodulation scheme under the influence of noise. In this paper, we construct a very general
transfer function that relates intensity-induced input noise to its phase noise realization in the output for a wide
class of digital-demodulation techniques. We proceed to compute analytically a probability density function of this
output noise and use this to compute low-order statistical moments of the output noise. We compare the analytical
formulations with simulated data from a representative demodulation scheme used in a currently existing fiber Bragg
grating (FBG) sensor system and find excellent agreement.
© 2007 IEEE
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