Abstract
Abstract Different multiplexing techniques for passively addressing fiber-optic sensors and compensation schemes for overcoming the undesirable optical signal losses to provide self-referenced quasi-distributed sensing from intensity-based fiber-optic point sensors are revisited. Furthermore, a passive wavelength division multiplexing (WDM) network operating in reflective configuration with remote Radio-Frequency self-referenced fiber-optic intensity sensors with electro-optical configuration is proposed. Delay lines in the electrical domain provide more compact sensor-heads and easy-reconfigurable performance of the sensing points. The technique is analyzed following the Z-transform formalism and measurements validating the theoretical model are reported. There are two measurement parameters providing self-referenced remote interrogation for the sensing heads. The paper shows their experimental validation in a 2-sensor network based on tapered SMF micro-displacement sensors, testing sensor self-referencing as well as sensor crosstalk. Those results provide the background to extrapolate them to a quasi-distributed passive CWDM-based 16-sensor network at around 65 km of remote distance from the central office, with possible upgrade to a 25 km-long DWDM-based 48-sensor network.
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