Experimental study on the characteristics of high-birefringence long-period optical fiber gratings

this paper, the strain and temperature responses of long-period Bragg grating written on Panda fiber are presented. Both the strain and temperature responses show a good linear characteristics at a strain range of 0-2500 ?? and a temperature range of 50-100 °C . The temperature-tuning characteristics of the LPG by using a thin film metal coating on the nude surface of the fiber as a heater are also demonstrated. In the range of 0- 150 mA the response curve of the LPG have good linearity with the square of the current, while the loss change is less than 0.3dB.