,Influence of Internal Stresses in Few-Mode Fiber on the Thermal Characteristics of Regenerated Grat

• 作 者: Nurul Asha MOHD NAZAL Kok Sing LIM Yen Sian LEE Muhammad Aizi MAT SALIM Harith AHMAD
• 机 构: Photonics Research Centre, University of Malaya, Kuala Lumpur 50603, Malaysia“,”Laser Center, Ibnu S
• 出 处: 光子传感器（英文版）
• 发表日期: 2019年2期
• 关键词: Regenerated fiber Bragg grating few-mode fiber thermal stress relaxation CO2 las

The pre-treatment of few-mode fibers (FMFs) has been successfully done with CO2 laser.The wavelength difference,Aλ 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 Aλ 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 Aλ.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.