A Practical Approach to Synthesize Multi-channel Fiber Bragg Grating with Right-Angled Triangular Spectrum
YU Xue-Lian1,2, YAO Yong1**, XIAO Jun-Jun1, TIAN Jia-Jun1
1School of Electronic and Information Engineering, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055 2Department of Optics Information Science and Technology, Harbin University of Science and Technology, Harbin 150080
Abstract：A novel approach is proposed towards the design of fiber Bragg gratings with multi-channel right-angled triangular spectrum. Firstly, a single-channel grating is synthesized utilizing an adaptive quantum particle swarm optimization with the piecewise constant mutated factor. Meanwhile, the reflectivity spectrum with good linear edge for a short grating is obtained. Then, for its merits of easy fabrication, the superposition method is adopted to design multi-channel gratings with initial spectral distortion. Finally, this distortion is optimized by the method in the first step. It is shown that the design outcomes still retain the features of easy fabrication and short length. Such gratings would be useful as wavelength-interrogation devices with multiple physical parameters in optical sensor systems.
2012, Vol. 29 
