Unscrambling light—automatically undoing strong mixing between modes

Andrea Annoni; Emanuele Guglielmi; Marco Carminati; Giorgio Ferrari; Marco Sampietro; David AB Miller; Andrea Melloni; Francesco Morichetti

doi:10.1038/lsa.2017.110

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Unscrambling light—automatically undoing strong mixing between modes

Original Articles

- Unscrambling light—automatically undoing strong mixing between modes
- Light: Science & Applications Vol. 6, Issue 4, (2017)
- Affiliations：
  
  1.Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Milano 20133, Italy
  2.Ginzton Laboratory, Stanford University, Spilker Building, Stanford, CA 94305, USA
- Author bio：
  
  F Morichetti, Email: francesco.morichetti@polimi.it
- Funds：
- DOI：10.1038/lsa.2017.110
  CLC：
- Published：2017-12，
  
  Published Online：30 June 2017，
  
  Received：08 February 2017，
  
  Revised：23 June 2017，
  
  Accepted：27 June 2017
- Accepted：
Scan QR Code
Annoni, A. et al. Unscrambling light—automatically undoing strong mixing between modes. Light: Science & Applications, 6, e17110 (2017).
DOI：

Annoni, A. et al. Unscrambling light—automatically undoing strong mixing between modes. Light: Science & Applications, 6, e17110 (2017). DOI： 10.1038/lsa.2017.110.

摘要

Abstract

Propagation of light beams through scattering or multimode systems may lead to the randomization of the spatial coherence of the light. Although information is not lost

its recovery requires a coherent interferometric reconstruction of the original signals

which have been scrambled into the modes of the scattering system. Here we show that we can automatically unscramble optical beams that have been arbitrarily mixed in a multimode waveguide

undoing the scattering and mixing between the spatial modes through a mesh of silicon photonics tuneable beam splitters. Transparent light detectors integrated in a photonic chip are used to directly monitor the evolution of each mode along the mesh

allowing sequential tuning and adaptive individual feedback control of each beam splitter. The entire mesh self-configures automatically through a progressive tuning algorithm and resets itself after significantly perturbing the mixing

without turning off the beams. We demonstrate information recovery by the simultaneous unscrambling

sorting and tracking of four mixed modes

with residual cross-talk of −20 dB between the beams. Circuit partitioning assisted by transparent detectors enables scalability to meshes with a higher port count and to a higher number of modes without a proportionate increase in the control complexity. The principle of self-configuring and self-resetting in optical systems should be applicable in a wide range of optical applications.

关键词

Keywords

optical processingphotonic integrated circuitssilicon photonicstuneable photonic devices

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