Temperature sensitivity enhancement technology of fiber Bragg gratings

The temperature sensitivity of fiber Bragg gratings has been improved largely by a kind of polymerpackage with biggish thermal expansion coefficient using a special technology.Within 20～90℃,it was obtained that the average temperature sensitivity coefficient of polymerpackaged fiber Bragg gratings was η′=112447×10-6/℃,which enhanced 15.804 times as much as the value of bare fiber Bragg grating.The temperature sensitivity was 0176 nm/℃,which enhanced 16 times.And the reflected wavelength shift enhanced 1594 times.Both temperature response curves of bare and polymerpackaged fiber.Bragg gratings have better linearity.