We describe the design and fabrication of an ultracompact optical mode order converter employing submicron waveguides. The mode converter can realize optical mode conversion between zeroth- and first-order optical modes with a device footprint less than 18 mum by 3 mum. The optical mode converter could be employed in various types of photonic integrated circuits where optical mode order conversion is needed
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Huang et al. (2006) studied this question.
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