14 MHz rate photon counting with room temperature InGaAs/InP avalanche photodiodes

Paul L. Voss, Kahraman G. Köprülü, Sang Kyung Choi, Sarah Dugan, Prem Kumar

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


We have developed high speed gated-mode single-photon counters based on InGaAs/InP avalanche photodiodes for use at 1.55 μm wavelength. Operation at room temperature allows afterpulse probability to be below 0.2% for gate rates up to 14 MHz. We obtained optimum noise-equivalent power of 2.2 ×s; 10−15 W Hz−1/2 at 14% quantum efficiency with dark-count probability of 0.2%. We propose a metric (noise-equivalent power divided by gate frequency) for comparing high speed photon counters and show that for this metric our system outperforms previously reported counters at 1.55 μm wavelength. We demonstrate that for gate widths of a nanosecond or below, the differing amplitude distributions of dark versus light counts allow an optimal decision threshold to be set for a given bias voltage.

Original languageEnglish (US)
Pages (from-to)1369-1379
Number of pages11
JournalJournal of Modern Optics
Issue number10
StatePublished - 2004

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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