Three-Wave Fiber Fabry-Perot Interferometer for Simultaneous Measurement of Temperature and Water Salinity of Seawater

Document Type

Journal Article


IEEE Press


Faculty of Computing, Health and Science


Electron Science Research Institute (ESRI) / Centre of Excellence for MicroPhotonic Systems (COMPS)




This article was originally published as: Nguyen, L. V., Vasiliev, M. , & Alameh, K. (2011). Three-wave fiber Fabry-Perot interferometer for simultaneous measurement of temperature and water salinity of seawater. IEEE Photonics Technology Letters, 23(7), 450-452. Original article available here


We report a fiber sensor for simultaneous measurement of temperature and water salinity. The proposed sensor structure is based on a three-wave Fabry-Pérot interferometer (FPI) fabricated in a single-mode optical fiber (SMF) by focused ion beam (FIB) milling. The open cavity of the three-wave FPI was filled with water under test and used as the main sensing element and the lengths of the open and silica cavity were comparable. These features of the proposed sensor lead to three groups of interference fringes with distinct sensitivities in the wavelength domain with respect to the changes in both the water salinity and ambient temperature are obtained. Consequently, simultaneous determination of the ambient temperature and water salinity variations is achieved using the sensitivity matrix method.


Link to publisher version (DOI)