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Creators/Authors contains: "Yu, Qianhuan"

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  1. ; ; ; ; ; ; ; ; (, 2023 Optical Fiber Communications Conference and Exhibition (OFC))
    We demonstrate InGaAs/InP balanced photodiodes onSi3N4waveguides with record-high 3-dB bandwidth of 30 GHz, 0.72 A/W responsivity, and high common mode rejection ratio (CMRR) of 26 dB at 30 GHz. 
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    Full Text Available 
  2. ; ; ; ; (, Optics Express)
    We investigate the feasibility and performance of photon-number-resolved photodetection employing single-photon avalanche photodiodes (SPADs) with low dark counts. While the main idea, to splitnphotons intomdetection modes with a vanishing probability of more than one photon per mode, is not new, we investigate here a important variant of this situation where SPADs are side-coupled to the same waveguide rather than terminally coupled to a propagation tree. This prevents the nonideal SPAD quantum efficiency from contributing to photon loss. We propose a concrete SPAD segmented waveguide detector based on a vertical directional coupler design, and characterize its performance by evaluating the purities of Positive-Operator-Valued Measures (POVMs) in terms of number of SPADs, photon loss, dark counts, and electrical cross-talk. 
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