Based on analysis of the near infrared spectral absorption of CO molecule and considering factors such
as compatibility with the transmission characteristics of silica optical fiber and the price, a kind of allfiber
remote sensor utilizing Fiber Bragg Grating(FBG) filters and 1.567μm high power light-emitting
diode (LED) was developed for real time absorption measurement. FBG has a low insert loss and can
be produced easily compared with dielectric interference filters. Theory and experiment proved that the
system has simple construct and high sensibility.