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Multimode spatial-division multiplexing (SDM) technol- ogy has attracted much attention for its potential to enhance the ca- pacity of an optical-interconnect link with a single wavelength car- rier. For a mode-multiplexed optical-interconnect link, the functional elements are quite difierent from the conventional ones as multiple modes are involved. In this paper we give a review and discussion on multimode photonic integrated devices for mode-multiplexed optical- interconnects. Light propagation and mode conversion in tapered waveguides as well as bent waveguides are discussed flrst. Recent progress on mode converter-(de)multiplexers is then reviewed. The demands of some functional devices used for mode-multiplexed optical- interconnects are also discussed. In particular, the fabrication toler- ance is analyzed in detail for our hybrid demultiplexer, which enables mode-/polarization-division-(de)multiplexing simultaneously.

SILICON MULTIMODE PHOTONIC INTEGRATED DEVICES FOR ON-CHIP MODE-DIVISION-MULTIPLEXED OPTICAL INTERCONNECTS