Abstract
We report on the design and prototyping of a robust high-speed interferometric
multiplexer and interrogator for fiber Bragg grating sensors. The scheme is
based on the combination of active WDM channel switching and passive, instantaneous
interferometry, allowing the resolution of virgin interferometric interrogators
to be retained at MHz multiplexing rates. In this article the system design
and operation are described, and a prototype scheme is characterized for three
sensors and a multiplexing rate of 4 kHz, demonstrating a noise floor of 10
nε/√Hz and no cross-sensitivity. It is proposed that the system
will be applicable to demanding monitoring applications requiring high speed
and high resolution measurements across the sensor array.
© 2011 IEEE
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