Abstract
A novel interrogation technique for fiber Bragg gratings is presented. It is based on measuring the characteristics of the outgoing near-field radiation from a tilted fiber grating. This scheme was experimentally checked and was found to offer a wide wavelength interrogation range as well as a good linearity, stability, and wavelength resolution.
Highlights
The principle of operation of the proposed technique is based on a photodetector linear array that measures the near-field radiation outcoupled by an in-f iber tilted grating when it is illuminated by light ref lected by sensing Fiber Bragg grating (FBG)
The operating principle of such a demultiplexing technique is based on the fact that the radiation shape emitted by the tilted FBG is unique for each wavelength, and so it constitutes a fingerprint for that parameter
When one has a database of these fingerprints and uses appropriate signal processing, the individual shapes can be recovered from the composite image
Summary
The principle of operation of the proposed technique is based on a photodetector linear array that measures the near-field radiation outcoupled by an in-f iber tilted grating when it is illuminated by light ref lected by sensing FBGs. By performing an analysis of the characteristics of this radiation, one can infer the wavelengths of the light from which it originated.
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