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Interferometric sensor interrogation using an arrayed waveguide grating

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3 Author(s)
Norman, D.C.C. ; Photonics Res. Group, Aston Univ., Birmingham, UK ; Webb, D.J. ; Pechstedt, R.D.

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-Pe/spl acute/rot cavity by determining the optical phase changes of the scanned interferometric pattern, which produced a maximum unambiguous range of 1440 μm with an active sensor and a maximum unambiguous range of 300 μm with the introduction of a second processing interferometer, which allows the sensor to be passive.

Published in:

Photonics Technology Letters, IEEE  (Volume:17 ,  Issue: 1 )