Influence of Internal Stresses in Few-Mode Fiber on the Thermal Characteristics of Regenerated Gratings
Document Type
Article
Publication Date
1-1-2019
Abstract
The pre-treatment of few-mode fibers (FMFs) has been successfully done with CO2 laser. The wavelength difference, Δλ between the two resonant wavelengths in the few-mode fiber Bragg grating (FMFBG) varies with temperature increment during the annealing process. The results show that the treated fibers with lower stresses have lower thermal sensitivity in Δλ than that of non-treated fiber. However, the treated fibers produce FMFBGs with better thermal durability and regeneration ratio. It is conceived that the presence of those stresses in the pristine fiber is responsible for the high thermal sensitivity in Δλ. The thermal relaxation of stresses and structural rearrangement during the thermal annealing process are responsible for the degradation of the strength and resilience of the regenerated grating. © 2018, The Author(s).
Keywords
CO2 laser annealing, few-mode fiber, Regenerated fiber Bragg grating, thermal resilience, thermal stress relaxation
Divisions
photonics
Funders
Fundamental Research Grant Scheme (FRGS) (Grant No. FP033-2017A)
Publication Title
Photonic Sensors
Volume
9
Issue
2
Publisher
SpringerOpen