Interferometric sensor interrogation using an arrayed waveguide grating

Abstract

We experimentally investigate the use of an arrayed waveguide grating (AWG) to interrogate interferometric sensors. A single broad-band light source is used to illuminate the system. Reflected spectral information is directed to an AWG with integral photodetectors providing 40 electrical outputs. We show that using the dual-wavelength technique we can measure the length of a Fabry-Perot cavity by determining the optical phase changes of the scanned interferometric pattern, which produced a maximum unambiguous range of 1440 mum with an active sensor and a maximum unambiguous range of 300 mum with the introduction of a second processing interferometer, which allows the sensor to be passive.

Uncontrolled Keywords: Fabry-Perot interferometers, arrayed waveguide gratings, fibre optic sensors, photodetectors, Fabry-Perot cavity, dual-wavelength technique integral photodetectors, interferometric sensor interrogation
Published Date: 2005-01
Authors: Norman, D.C.C.
Webb, David J.
Pechstedt, R.D.

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