Mode multiplexed single-photon and classical channels in a few-mode fiber

Joel Carpenter, Chunle Xiong, Matthew J. Collins, Juntao Li, Thomas F. Krauss, Benjamin J. Eggleton, Alex S. Clark*, Jochen Schroeder

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


We classically measure the entire propagation matrix of a few-mode fiber and use a spatial light modulator to undo modal mixing and recover single-photons launched onto each of the eigenmodes of the fiber at one end, but arriving as mixed modal superpositions at the other. We exploit the orthogonality of these modal channels to improve the isolation between a quantum and classical channel launched onto different spatial and polarization modes at different wavelengths. The spatial diversity of the channels provides an additional 35dB of isolation in addition to that provided by polarization and wavelength. (C) 2013 Optical Society of America

Original languageEnglish
Pages (from-to)28794-28800
Number of pages7
JournalOptics Express
Issue number23
Publication statusPublished - 18 Nov 2013


  • Key distribution
  • Slow-light
  • Entanglement
  • Transmission


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