Interferometric sensor interrogation using an arrayed waveguide grating

Norman, D.C.C., Webb, David J. and Pechstedt, R.D. (2005). Interferometric sensor interrogation using an arrayed waveguide grating. IEEE photonics technology letters, 17 (1), 172 - 174.

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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