gratings in fibres;
wavelength division multiplexing;
D O I:
10.1049/el:19971264
中图分类号:
TM [电工技术];
TN [电子技术、通信技术];
学科分类号:
0808 ;
0809 ;
摘要:
Dense WDM systems demand fibre Bragg gratings (FBG) with low sidelobes and a sharp spectral skirt. A new apodised phase mask is reported here for efficiently suppressing sidelobes in FBG production. A 20dB sidelobe reduction, measured by both an OSA and a tunable laser scanning technique, was achieved. The skirt steepness, which is a ratio of the FBG reflection bandwidth al -25dB to the bandwidth at -0.5dB, was demonstrated to be 1.85. The FBGs are suitable for dense WDM with a channel spacing of < 0.8nm.