.Design of a broad spectrum multichannel optical filter based on FBG[J].Optoelectronics Letters,2009,5(2):131-134 Design of a broad spectrum multichannel optical filter based on FBG 刘海涛  潘炜  闫连山  罗宾  温坤华  冯显贵 Center for Information Photonics &Communications, Southwest Jiaotong University, Chengdu 610031, China ? Abstract:       To increase the channel number in the optic filter, the multiple-phase-shift (MPS) technology is adoped based on the multiple-reflection-spectrum-envelopes-concatenation (MRSEC) model which has a broadband flatness. The reflection spectra of the MPS digital concatenated sample gratings are simulated with transfer matrix method, the results show that wave band of the reflection spectrum is widened and the channel number is multiplied. What's more, the spectrum flatness is improved with the increasing of refraction index change. Moreover, to improve the extinction ratio and peak value when MPS is adopted in concatenated SFBG, an available designing method based on the cascaded unit is put forward and the optimized results are obtained. Hits: 3932 Download times: 230 View Full Text    Download reader