Large refractive index modulation based on BDK-doped step-index PMMA optical fiber for highly reflective Bragg grating inscription
Posted on 10.06.2021 - 13:56
We experimentally report high reflectivity on the poly(methyl methacrylate) (PMMA)-based polymer optical fiber Bragg gratings (POFBGs) by means of a 266 nm solid state pulsed laser and phase mask technique. The fiber core is doped with benzyl dimethyl ketal (BDK) being able to increase not only refractive indices but also photosensitivity of the core. In the first recipe, fiber Bragg gratings (FBGs) were manufactured with a single pulse up to 3.7 mJ. After post-annealing, a stable refractive index change up to 4.2×10−4 was obtained. In the second recipe, FBGs were inscribed by 22 pulses with a lower pulse energy of 1.4 mJ, showing a stable refractive index change of 6.2×10−4 without post-annealing thermal treatment. Both behaviors may mainly be attributed to the movement of initiating radicals arising from BDK under UV irradiation.
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Hu, Xuehao; Yue, Xiaoyu; Cheng, Xin; Gao, Shixin; Min, Rui; Wang, Heng; et al. (2021): Large refractive index modulation based on BDK-doped step-index PMMA optical fiber for highly reflective Bragg grating inscription. The Optical Society. Collection. https://doi.org/10.6084/m9.figshare.c.5427882.v2
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Hwa Yaw Tam