Arc-Induced Long Period Fiber Gratings in the Dispersion Turning Points (original) (raw)
2016, Journal of Lightwave Technology
We demonstrated the possibility to inscribe longperiod fiber gratings (LPFGs) in a B/Ge co-doped fiber by using grating periods shorter than 150 m. We have also arcinduced in the SMF 28 fiber a LPFG in the dispersion turning points by using a grating period of 197 m. In previous works the shortest periods were respectively, of the order of 190 m and 320 m for the same fibers. To achieve such a considerable reduction in the grating periods which enables access to the higher order cladding modes (higher sensitivity), we have developed a high voltage power supply that allows for a constant and stable electric current ranging from 10.5 mA up to 21 mA. Computer simulations were used to identify the cladding mode resonances for each grating inscribed in the different fibers. The fabricated LPFGs were characterized as a function of the external refractive index from 1.33 up to 1.42 and an average refractive index sensitivity of 720 nm/RIU in the 1.33-1.41 range was obtained without further optimization, such as the use of etching or thin films deposition.
Loading Preview
Sorry, preview is currently unavailable. You can download the paper by clicking the button above.