All-optical microwave filters using uniform fiber Bragg gratings with identical reflectivities

作者：Zeng F; Yao JP^*

来源：Journal of Lightwave Technology, 2005, 23(3): 1410-1418.

DOI：10.1109/JLT.2004.839981

• all-optical microwave filter
• broadband source
• fiber Bragg grating
• high birefringence fiber
• Lyot-Sagnac loop

We propose a novel approach to realizing all-optical microwave filtering using an array of fiber Bragg gratings with identical reflectivities. The filter tapping coefficients are determined by the spectrum profile of a broadband light source and the central wavelengths of the gratings. Since the fiber Bragg gratings have identical refiectivities, the characteristics of the gratings with high uniformity are possible, which simplifies the fiber Bragg grating fabrication and reduces the implementation error. In addition, the spectrum profile of the broadband light source can be controlled using an optical filter, which could be used to control the filter coefficients to suppress the filter sidelobes. A microwave filter using four fiber Bragg gratings is experimentally implemented.

• 出版日期2005-3