Femtosecond inscription and thermal testing of Bragg gratings in high concentration (40 mol%) germania-doped optical fibre

Donko, Andrei; Núñez-Velázquez, M.; Barua, Pranabesh; Guzman, Fernando; Ismaeel, Rand; Lee, T.; Sahu, J.K.; Beresna, Martynas; Brambilla, Gilberto

doi:10.1364/oe.25.032879

Cited by 4 publications

(2 citation statements)

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“…We suggest achieving an inscription in a certain core by using a preform and, hence, a fiber with cores consisting of different dopants to adjust photosensitivity. Optical fibers with high germania content in the cores are known to change refractive index under UV illumination condition [ 20 , 21 , 22 ]. At the same time, many other dopant materials show no or very poor photosensitivity to UV light.…”

Section: Methodsmentioning

confidence: 99%

“…The sub-preforms are made of different single-core structures, where the core doping defines the photosensitivity. For the fiber cores with a high photosensitivity typically a high germania doping is used (15–40 mol%) [ 20 , 26 ]. Such concentrations elevate the refractive index of a core [ 26 , 27 , 28 , 29 , 30 ], while also being beneficial for guiding properties.…”

Section: Methodsmentioning

confidence: 99%

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Composed Multicore Fiber Structure for Extended Sensor Multiplexing with Fiber Bragg Gratings

Idrisov

Lorenz

Rothhardt

et al. 2022

Sensors

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A novel multicore optical waveguide component based on a fiber design optimized towards selective grating inscription for multiplexed sensing applications is presented. Such a fiber design enables the increase in the optical sensor capacity as well as extending the sensing length with a single optical fiber while preserving the spatial sensing resolution. The method uses a multicore fiber with differently doped fiber cores and, therefore, enables a selective grating inscription. The concept can be applied in a draw tower inscription process for an efficient production of sensing networks. Along with the general concept, the paper discusses the specific preparation of the fiber-based sensing component and provides experimental results showing the feasibility of such a sensing system.

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Section: Methodsmentioning

confidence: 99%