Over the past two decades, integrated photonics has achieved unprecedented advancement owing to the development of optical devices. Among those devices, waveguide Bragg gratings are widely used for optical true time delay and optical filtering. In general, the integration of WBGs faces several challenges, including high insertion loss and manufacturing difficulties. In this article we propose and experimentally demonstrated a novel waveguide Bragg grating design based on multimode waveguide. The proposed device features low overall insertion loss of 3.1dB.
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