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- W596650007 abstract "FBG are intracore structures that select specific wavelengths of light passing through them, so act like narrow-band filters for specific wavelength. They reflect some wavelengths, called Bragg wavelength, transmitting the rest. FBGs have many applications e.g. optical filters in Telecom applications for wavelength filtering in WDM (wavelength division multiplexing) systems or in DBR lasers (distributed Bragg reflectors), where they are capable of limiting the emission to a very narrow spectral range. Furthermore, they are suitable for sensing applications for monitoring the strain or temperature variation through the Bragg shift. One problem with normal FBGs is their temperature stability. Typical FBGs can be made stable below 300-400 oC, but will be completely erased at temperatures above 700 0C. On the other hand, Chemical Composition Gratings (CCGs) have been shown to survive temperatures above 1000 oC. They are believed to be formed due to a change in chemical composition in the core of the fiber. In this case the decay mechanism is due to diffusion. This project aims to study the thermal decay mechanism of FBGs at high temperatures. Normal FBGs start to decay around 150 °C and typically the periodic refractive index modulation is completely erased around 600-700 °C. A special type of FBG, Chemical Composition Gratings (CCGs), survive temperatures in excess of 1000 °C and are believed to result from a modification of the core composition. In this case the decay mechanism should depend on diffusion. The project goal is to study the decay of CCGs, specifically F-CCGs, in order to assess the decay mechanism, experimentally together with simulations." @default.
- W596650007 created "2016-06-24" @default.
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- W596650007 date "2014-01-01" @default.
- W596650007 modified "2023-09-27" @default.
- W596650007 title "Study of high temperature decay mechanisms of Fiber Bragg Gratings" @default.
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