We report the inscription of as many as 10 superimposed Bragg gratings of high reflectivity in a 25-mm segment of fiber. Using hydrogenated boron codoped and germanosilicate fibers, we inscribed 10 superimposed gratings with reflectivities above 80% and 6 superimposed gratings with reflectivities above 98%, respectively. The superimposed gratings had unequal wavelength spacing and were written over a 20-nm wavelength span in the region of 1530 nm. The inscription of each new grating caused an increase in the FWHM linewidth of the existing gratings, while their reflectivity was unaffected.
© 2002 Optical Society of America
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
A. Arigiris, M. Konstantaki, A. Ikiades, D. Chronis, P. Florias, K. Kallimani, and G. Pagiatakis, "Fabrication of high-reflectivity superimposed multiple-fiber Bragg gratings with unequal wavelength spacing," Opt. Lett. 27, 1306-1308 (2002)