Influence of the strain and the temperature on the grating reflectivity

Summary form only given. As a key component for today´s and future wavelength division and multiplexing (WDM) telecommunication network, fibre Bragg gratings (FBGs) have been heavily studied for one decade Bragg gratings are written in the fiber core using the UV light side exposure technique. These grating components are commonly characterized by the reflection coefficient R and the Bragg wavelength /spl lambda//sub B/. In the spectral range from 1500 nm to 1600 nm, the Bragg wavelength /spl lambda//sub B/ will change with the temperature (/spl Delta//spl lambda//sub B///spl Delta/T around 001 nm//spl deg/C depending an the fiber) and the strain (/spl Delta//spl lambda//sub B/=5 2 10/sup -4/ nm//spl mu/E) applied to the component written in the optical fiber. In this paper, we report that both strain and temperature also cause a change in the reflectivity of Bragg gratings.