A novel design methodology for superstructure fiber Bragg grating comb-filter
一种新颖的超结构光纤Bragg光栅梳状滤波器的设计

A novel superstructure fiber Bragg grating (SFBG) comb filter for multi wavelength laser is proposed. This SFBG is characterized by its single grating structure, both refractive index modulation and local chirp abundant in variation, symmetrical reflection peaks, narrow bandwidth and standard channel spacing. Based on layer peeling inverse scattering technique, adopting independent channel by channel apodizing windowing method rather than integral apodizing windowing procedure, the desired SFBG is figured out successfully. The fabrication techniques for this SFBG are discussed as well. Reflection spectrum, group time delay and group time delay ripple are analyzed by the method of transformation matrix. The results show that this SFBG satisfied all requirements of designing target. In DWDM optical fiber telecommunication systems, this novel SFBG is a promising candidate for the perfect high performance comb filter used in multi wavelength laser.