Multimode fiber influence on single-photon avalanche diode timing jitter

Alexandra Lee, Ross J. Donaldson, Craig Whitehill, Alfonso Tello

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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The timing jitter of a single-photon avalanche diode (SPAD) can be a limiting factor for the performance of quantum key distribution (QKD). Within QKD receiver modules, single mode fiber coupling has been extensively studied due to optical fiber-based demonstrations. However, multimode fiber, which is utilized for free-space demonstrations because it reduces the coupling losses, has been less extensively studied, but it is understood that multimode fibers will increase the timing jitter and decrease the performance of the detector as the fiber core diameter increases. Here, we present a collection of experimental analysis over the relationships between characteristics of multimode fiber such as length, core diameter and incident spot size and how this impacts the timing jitter of the detector. Additionally, we present analysis on the use of graded-index multimode fibers, mitigating for a portion of the impact on quantum bit error rate (QBER) due to multimode characteristics which can improve implementation of these receiver systems.
Original languageEnglish
Title of host publicationQuantum Optics and Photon Counting 2023
ISBN (Electronic)9781510662612
ISBN (Print)9781510662605
Publication statusPublished - 6 Jun 2023
EventSPIE Optics + Optoelectronics 2023 - Prague, Czech Republic
Duration: 24 Apr 202328 Apr 2023

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceSPIE Optics + Optoelectronics 2023
Country/TerritoryCzech Republic
Internet address


  • Fiber
  • Quantum Key Distribution
  • Single Photon Avalanche Diodes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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