High - birefringence and non-linearly chirped fibre grating（ Hi-Fi-NLCFBG）

as a kind of new-type optics device

is widely used in the field of the compensator to polarization mode dispersion （ PMD）. This artical analysed Hi-Fi-NLCFBG principle at first

then numerically analysed the spectrum characteristic of Hi-Fi-NLCFBG

Characteristic

temperature and stress characteristic that prolongs. At last

according to the analysis result

to resolve the problem of stabilities of the Hi-Fi-NLCFBG compensation machine

some suggestions are proposed .