Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7223023 | Optik - International Journal for Light and Electron Optics | 2018 | 11 Pages |
Abstract
The inscription of fiber Bragg grating (FBG) in a pure-silica multi-core photonic crystal fiber (PCF) using femtosecond laser and phase mask is reported. Three resonant dips are observed in the transmission spectrum due to the multiple supermodes transmitted in the PCF. The induced refractive index modulation of 2.2â¯Ãâ¯10â4 is achieved for a peak power density of 4.8â¯Ãâ¯1013â¯W/cm2 without any fiber sensitization. The experimental results show that type II grating is inscribed and it has high thermal stability. The temperature corresponding to 50% decrease in transmission loss of the FBG is about 970â¯Â°C. The central wavelengths of the three dips linearly shift with pressure sensitivity of â4.8â¯pm/MPa and strain sensitivity of 1.2â¯pm/με. This FBG will find applications in optical fiber sensing under high temperature.
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Engineering (General)
Authors
Hongli Xiang, Yajun Jiang,