We demonstrate a long-period grating whose resonance varies in strength but remains fixed in wavelength with either temperature or strain. Using this fiber-grating sensor, we resolved a change of 1 με of strain or 0.04 °C in temperature. Such sensors require no spectrometer or other frequency-selective components and can operate in real time.
© 2000 Optical Society of America
(060.2340) Fiber optics and optical communications : Fiber optics components
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.2400) Fiber optics and optical communications : Fiber properties
(350.2770) Other areas of optics : Gratings
Victor Grubsky and Jack Feinberg, "Long-period fiber gratings with variable coupling for real-time sensing applications," Opt. Lett. 25, 203-205 (2000)