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首页> 外文期刊>Electron Devices Society, IEE >Discrimination of Photon- and Dark-Initiated Signals in Multiple Gain Stage APD Photoreceivers
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Discrimination of Photon- and Dark-Initiated Signals in Multiple Gain Stage APD Photoreceivers

机译：区分多个增益级APD光接收器中的光子和暗启动信号

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摘要

We demonstrate the ability of linear mode single carrier multiplication (SCM) avalanche photodiode (APD)-based optical receivers to discriminate single-photon-initiated avalanche events from dark-current-initiated events. Because of their random spatial origin in discrete regions of the depletion region, in the SCM APD the dark-generated carriers multiply differently than the photon-generated carriers. This causes different count distributions and necessitates different statistical descriptions of the signal contributions from photon- and dark-originating impulse responses. To include dark carriers in the performance models of the SCM APD, we considered the influence of the spatial origin of the ionization chains on a receiver's noise performance over the times the optical pulse is integrated by the receiver's decision circuits. We compare instantaneous (time-resolved) numeric and pseudo-DC analytical models to measured SCM APD data. It is shown that it is necessary to consider both the distribution of spatial origin and the instantaneous properties of the ionization chains to describe statistically an SCM APD receiver. The ability of SCM APD receivers to discriminate single photon events from single dark events is demonstrated, and the effective gain and excess noise contributions of the light- and dark-initiated avalanche events and their influence on receiver sensitivity and signal-to-noise characteristics are shown.
机译：我们展示了基于线性模式单载波倍增​​（SCM）雪崩光电二极管（APD）的光接收器能够区分单光子引发的雪崩事件与暗电流引发的事件的能力。由于它们在耗尽区离散区域中的随机空间起源，因此在SCM APD中，暗产生的载流子与光子产生的载流子的繁殖方式不同。这会导致不同的计数分布，并且需要对源自光子和暗源脉冲响应的信号贡献进行不同的统计描述。为了将暗载波包含在SCM APD的性能模型中，我们考虑了电离链的空间起源对接收器决策电路对光脉冲进行积分后对接收器噪声性能的影响。我们将瞬时（时间分辨）数值模型和伪DC分析模型与测量的SCM APD数据进行比较。结果表明，有必要考虑空间起源的分布和电离链的瞬时特性，以便从统计学上描述SCM APD接收器。证明了SCM APD接收器将单个光子事件与单个暗事件区分开的能力，并且亮和暗引发的雪崩事件的有效增益和多余噪声贡献及其对接收器灵敏度和信噪比特性的影响也得到了证明。如图所示。

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