Abstract

A novel technique to interrogate a long-period grating (LPG) using a mechanically scannable arrayed waveguide grating (AWG) is proposed. This technique is implemented based on space-to-wavelength mapping by mechanically scanning the input light beam along the input coupler facet of an AWG. By employing a sampled chirped fiber Bragg grating with multiple peaks as a reference, the central wavelength of the LPG is measured. An interrogation system with a resolution of $10\mathrm{pm}$ at a speed of $10\mathrm{Hz}$ is demonstrated. Furthermore, the technique proposed can potentially offer subpicometer resolution at a speed of $500\mathrm{Hz}$.

© 2008 Optical Society of America

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