Patent ID: 6879742

Claim:
A using intensity and wavelength division multiplexing for fiber Bragg grating sensor system, which comprises: a light-division device having two receiving-sending terminals and equal to or larger than two sensing terminals for distributing different light power ratio from said receiving-sending terminals to said sensing terminals; a light generating device adapted for optical signal coupled with said receiving-sending terminal, said optical signal having optical channels of the classification of wavelength; sensing fibers coupled with said sensing terminals, said sensing fiber at least comprising a fiber Bragg grating to form reflective signal corresponding to said optical channel; a photo detector for detecting backreflected energy signal coupled with said receiving-sending terminal; and an information processor connecting with said photo detector to calculate the backreflected wavelength, wherein said light-division device comprises a feedback terminal which is an output obtained by said receiving-sending terminal to output fixed power ratio, that is optical feedback of light-division device.