Fiber Bragg grating interrogation and multiplexing with a 3×3coupler and a scanning filter |
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| Authors: | Johnson GA Todd MD Althouse BL Chang CC |
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| Affiliation: | Sect. of Fiber Opt. Smart Struct., U.S. Naval Res. Lab., Washington, DC; |
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| Abstract: | We present a new technique for fiber Bragg grating (FBG) sensor interrogation and multiplexing. The technique combines a scanning bandpass filter used to multiplex by wavelength multiple gratings in a single fiber, and an unbalanced Mach-Zehnder fiber interferometer made with a 3×3 coupler to detect strain-induced wavelength shifts. A demonstration system interrogates four gratings in a single fiber at a sampling rate up to 20 kHz, with a noise floor measured at less than 10 nϵ/√(Hz) above 0.1 Hz |
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