Work

Efficiency-Resolved Recovery Dynamics of an Free-Running InGaAs/InP Single Photon Avalanche Detector Operated in Gated Mode

Year: 2026

Type: preprint

Abstract: Detection efficiency in gated-mode single-photon avalanche detectors recovers gradually after each gate edge, limiting attainable count rates, yet quantitative recovery models exist only for free-running operation. We extract the gated recovery time constant of a free-running InGaAs/InP detector at 1550 nm by sweeping the gate frequency from 100 kHz to 1 MHz and globally fitting count rates across four dead times, requiring neither a pulsed laser nor a time-to-digital converter. The recovery time decreases linearly with detection efficiency, from 301 to 161 ns between 10 % and 25 %, at 9.3 ns per percentage point. We further resolve a periodic count-rate modulation consistent with bias-dependent capacitive gate feedthrough.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2609.17694

Authors: Souza, Bruno Santos, Tavares, Vitor, Ghiglieno, Filippo, Villas-Boas, Celso Jorge, Ferreira, Paulo Henrique Dias

Institutions: Universidade Federal de São Carlos, Universidade de Brasília

Language: English

Topic: Advanced Optical Sensing Technologies

Subfield: Instrumentation

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Fundação de Amparo à Pesquisa do Estado de São Paulo, Ministério da Ciência, Tecnologia e Inovação, Conselho Nacional de Desenvolvimento Científico e Tecnológico

Awards: G4140804063, G900546532, G909429356

OpenAlex ID: W7213497055

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