Abstract
A compact low-loss 4×4 arrayed waveguide grating (AWG) demultiplexer with a channel spacing of 400 GHz is presented. By employing a double-etch process, a low-loss device is made with deeply etched waveguides that have a bending radius down to 30 μm. This small radius and a reduction of the number of array arms, reduces the device size to only 230×330 μm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . Measured insertion losses are less than 5 dB and the crosstalk is below -12 dB. To our knowledge, this is the smallest AWG reported to date.
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