In this paper, we report a new filter by combining fiber-optic microring and lithium niobate microwaveguide chip. In our design, fiber-optic microring works as a resonator to trapped the resonant light and enlarge its optical energy. The lithium niobate microwaveguide chip serves as a mount to load the fiber-optic microring on the microwaveguide. Then the resonant light coupled from the microring could transmit through the microwaveguide and be detected. We experimentally demonstrated our design and its operation feasibility. The characteristic of the filter could be clearly observed. The results proved that the combination of fiber-optic microring and lithium niobate microwaveguide chip might provide an alternative way to integrate the fiber-optic micro and nanodevices on lithium niobate microwaveguide chip.
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