Optimization of 3-hole-assisted PMMA optical fiber with double cladding for UV-induced FBG fabrication

Abstract

Abstract:We propose a new hole-assisted polymer optical fiber design to eliminate the influence of dopant diffusion and to increase the UV writing efficiency in fiber Bragg grating inscription. The optical waveguide is formed inside a solid core surrounded by a ring of 3 large air holes in enhanced UV photosensitive PMMA with double-cladding. We determined a map of the single-mode and multi-mode phase transitions using a finiteelement-based vectorial optical mode solver. We obtained a wide range of geometrical configuration for the single-transverse-mode (HE11) propagation in the visible. The design is optimized to operate at the minimum optical loss wavelengths of 580 nm and 770 nm.

Evolution of the external quantum efficiency of Si-based PV minimodules with encapsulated down-shifters and aged under UV radiation

“…Then, the roughness of the DS layer not encapsulated produces light scattering of the DS photons, enhanced at shorter wavelengths and, consequently, reducing the amount of the DS photons that reaches the solar cell, hence resulting in less enhancement of the EQE of the device. Also, this effect could be attributed to a larger mismatch between refraction indexes for EVA, PMMA and low-iron glass at 300 -355 nm, but the opposite is reported in the scientific literature [37,38].…”