We compare the performance of silicon based arrayed waveguide gratings (AWGs) and echelle gratings for different channel spacings. For high resolution de/multiplexer applications AWGs are the better choice, while echelle gratings perform well for low resolution de/multiplexer applications. Alternatively, for low resolution de/multiplexer applications the conventional box-shaped AWG can be modified by an S-shaped AWG. We report crosstalk as low as -27 dB for regular AWGs, while in the S-shaped AWGs the crosstalk is better than -19 dB, with an insertion loss below -2 dB.
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