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We have proposed a compact spectroscopic sensor based on the arrayed waveguide grating (AWG) with the use of a wavelength multi/demultiplexer in a photonic network. We fabricated a new planar sensor using a visible AWG for spectroscopic sensing of absorption characteristics with multiple dicing grooves for accommodating a liquid sample. A parabola-shaped sample injection waveguide is effective for improving the sensitivity because diffraction loss in the direction of its substrate is reduced. In this research, discrimination of chlorophyll a and b as test samples is to be investigated using the AWG spectroscopic sensor with a parabolashaped sample injection waveguide.

Design and Application to Environmental Sensing of a Compact Spectroscopic Sensor using a Visible Arrayed Waveguide Grating