Self-referenced optical networks for remote interrogation of quasi-distributed fiber-optic intensity sensors Articles uri icon

publication date

  • September 2020

start page

  • 1

end page

  • 14

volume

  • 58

International Standard Serial Number (ISSN)

  • 1068-5200

abstract

  • Different multiplexing techniques for passively addressingfiber-optic sensors and compensation schemes forovercoming the undesirable optical signal losses to provide self-referenced quasi-distributed sensing from in-tensity-basedfiber-optic point sensors are revisited. Furthermore, a passive wavelength division multiplexing(WDM) network operating in reflective configuration with remote Radio-Frequency self-referencedfiber-opticintensity sensors with electro-optical configuration is proposed. Delay lines in the electrical domain providemore compact sensor-heads and easy-reconfigurable performance of the sensing points. The technique is ana-lyzed 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-displacementsensors, testing sensor self-referencing as well as sensor crosstalk. Those results provide the background toextrapolate them to a quasi-distributed passive CWDM-based 16-sensor network at around 65 km of remotedistance from the central office, with possible upgrade to a 25 km-long DWDM-based 48-sensor network.

keywords

  • fiber-optic sensors; optical intensity sensors; quasi-distributed sensor network; self-referencing, passive remote sensing