Abstract
We propose and experimentally demonstrate an ultra-compact multimode waveguide crossing that can process two modes simultaneously. The symmetric -junction is introduced to split the high-order modes into fundamental ones, easing the subsequent processing. The footprint of the proposed crossing is as compact as . The measured results show an insertion loss of for the mode and for the mode at 1550 nm, as well as a crosstalk of from 1510 to 1600 nm.
© 2017 Optical Society of America
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