Fiber Bragg grating interrogation and multiplexing with a 3/spl times/3 coupler and a scanning filter
作者： G.A. Johnson , M.D. Todd , B.L. Althouse , C.C. Chang
DOI: 10.1109/50.857755
关键词:
摘要: We present a new technique for fiber Bragg grating (FBG) sensor interrogation and multiplexing. The combines scanning bandpass filter used to multiplex by wavelength multiple gratings in single fiber, an unbalanced Mach-Zehnder interferometer made with 3/spl times/3 coupler detect strain-induced shifts. A demonstration system interrogates four at sampling rate up 20 kHz, noise floor measured less than 10 n/spl epsiv///spl radic/(Hz) above 0.1 Hz.
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