Towards mode-multiplexed fiber sensors

An investigation on the spectral response of etched graded index OM4 multi-mode fiber with bragg grating for refractive index and temperature measurement

authored by: Kort Bremer, Lourdes Shanika Malindi Alwis, Yulong Zheng, Bernhard Wilhelm Roth
Abstract: An investigation on the feasibility of utilizing Mode Division Multiplexing (MDM) for simultaneous measurement of Surrounding Refractive Index (SRI) and temperature using a single sensor element based on an etched OM4 Graded Index Multi Mode Fiber (GI-MMF) with an integrated fiber Bragg Grating (BG), is presented. The proposed work is focused on the concept of principle mode groups (PMGs) generated by the OM4 GI-MMF whose response to SRI and temperature would be different and thus discrimination of the said two parameters can be achieved simultaneously via a single sensor element. Results indicate that the response of all PMGs to temperature to be equal, i.e., 11.4 pm/°C, while the response to SRI depends on each PMG. Thus, it is evident that temperature "de-coupled" SRI measurement can be achieved by deducing the temperature effects experienced by the sensor element. Sensitivity of the PMGs to applied SRI varied from 3.04 nm/RIU to of 0.22 nm/RIU from the highest to lowest PMG, respectively. The results verify that it is feasible to obtain dual measurement of SRI and temperature simultaneously using the same, i.e., single, sensing element.
Organisation(s): Hannover Centre for Optical Technologies (HOT)
PhoenixD: Photonics, Optics, and Engineering - Innovation Across Disciplines
External Organisation(s): Napier University
Type: Article
Journal: Applied Sciences (Switzerland)
Volume: 10
No. of pages: 8
ISSN: 2076-3417
Publication date: 02.01.2020
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Materials Science(all), Instrumentation, Engineering(all), Process Chemistry and Technology, Computer Science Applications, Fluid Flow and Transfer Processes
Electronic version(s): https://doi.org/10.3390/app10010337 (Access: Open)