The application value and necessity of wavelength selective reflector in PON optical link test and diagnosis system were referred. The application characteristics of Fiber Bragg Grating(FBG) reflector were discussed
a comparison between FBG reflector and thin film filter(TFF) was made
and the current status of FBG reflector in the international market was also listed. Finally
the present progress that has been made to meet the cost requirement was briefly introduced.