A new technique for writing extremely short-length Bragg gratings in optical fibers is demonstrated. A physical model describes the diffraction effects on the spatial and wavelength spectra of the Bragg gratings. Selection of appropriate diffraction patterns and related parameters permits self-apodized Bragg gratings with a typical spatial length of several hundred micrometers and a bandwidth of several nanometers to be obtained. These gratings with well-defined spectra are suitable for use as miniature distributed strain sensors and other applications requiring small physical dimensions and broadband spectra.
© 2003 Optical Society of America
(050.1940) Diffraction and gratings : Diffraction
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(220.1230) Optical design and fabrication : Apodization
(350.2770) Other areas of optics : Gratings
Meng-Chou Wu and Robert S. Rogowski, "Fabrication of Self-Apodized Short-Length Fiber Bragg Gratings," Appl. Opt. 42, 5017-5023 (2003)