We have analyzed the effects of various normally distributed nonuniformities of sampled fiber Bragg gratings on the reflective spectra and group time delay. Through numerical simulations we have drawn the following conclusions: (1) the magnitude of nonuniformity with normal distribution of the fiber’s average refractive-index modulation δ̄<i>n</i><sub>eff</sub> greatly influences the characteristics of both reflective spectra and group time delay, whose suggested precision varies from 20% to 10%; (2) the nonuniformities of sampling periods <i>P</i> and sampling lengths <i>L</i> are important factors that influence the characteristics of the group time delay, and the accepted tolerance of dimensional precision of both <i>P</i> and <i>L</i> are ±4 μm; and (3) the tolerance of nonuniformity of the sampling period’s chirp coefficient is high, and its precision can be as great as 100% with few adverse effects.
© 2004 Optical Society of America
(050.2770) Diffraction and gratings : Gratings
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.2340) Fiber optics and optical communications : Fiber optics components
Qiang Wu, Chong-Xiu Yu, Kui-ru Wang, Xiang-jun Xin, Xu Wang, and Zhi-hui Yu, "Analysis of Nonuniformities of Sampled Fiber Bragg Gratings," Appl. Opt. 43, 5832-5837 (2004)