摘要A kind of ultra-narrow dual-channel filter is proposed in principle and demonstrated experimentally. This filter is designed by means of two sampled fibre Bragg gratings (SFBGs), where one is periodic 0--π sampling and the other is symmetrical spatial sampling. The former can create two stopbands in the transmission spectra and the latter can produce two ultra-narrow passbands. Our filter has the 3-dB bandwidth of about 1pm, whose value is two orders of magnitude less than the bandwidth of the traditional SFBG filters. The proposed filter has a merit that the channel spacing remains unchanged when tuning the filter.
Abstract：A kind of ultra-narrow dual-channel filter is proposed in principle and demonstrated experimentally. This filter is designed by means of two sampled fibre Bragg gratings (SFBGs), where one is periodic 0--π sampling and the other is symmetrical spatial sampling. The former can create two stopbands in the transmission spectra and the latter can produce two ultra-narrow passbands. Our filter has the 3-dB bandwidth of about 1pm, whose value is two orders of magnitude less than the bandwidth of the traditional SFBG filters. The proposed filter has a merit that the channel spacing remains unchanged when tuning the filter.
[1] Chen K et al 2004 Chin. Phys. Lett. 21 332 [2] Liu X M et al 2006 Chin. Phys. Lett. 23 1787 [3] Jia X J et al 2006 Chin. Phys. Lett. 23 2092 [4] Liu X et al 2005 Phys. Rev. A. 72 013811 [5] Sang X Z et al 2006 Chin. Phys. Lett. 23 3202 [6] Ibsen M et al 1998 IEEE Photon. Technol. Lett. 10 842 [7] Blais S R et al 2006 IEEE Photon. Technol. Lett. 18 2230 [8] Minasian R A 2006 IEEE Trans. Microwave Theory Tech. 54832
2007, Vol. 24 
