Modal noise characterisation of a hybrid reformatter

Izabela Spaleniak, David G. Maclachlan, Itandehui Gris-Sánchez, Debaditya Choudhury, Robert J. Harris, Alexander Arriola, Jeremy R. Allington-Smith, Timothy A. Birks, Robert R. Thomson

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

5 Citations (Scopus)
29 Downloads (Pure)


This paper reports on the modal noise characterisation of a hybrid reformatter. The device consists of a multicore-fibre photonic lantern and an ultrafast laser-inscribed slit reformatter. It operates around 1550 nm and supports 92 modes. Photonic lanterns transform a multimode signal into an array of single-mode signals, and thus combine the high coupling efficiency of multimode fibres with the diffraction-limited performance of single-mode fibres. This paper presents experimental measurements of the device point spread function properties under different coupling conditions, and its throughput behaviour at high spectral resolution. The device demonstrates excellent scrambling but its point spread function is not completely stable. Mode field diameter and mode bary-centre position at the device output vary as the multicore fibre is agitated due to the fabrication imperfections.

Original languageEnglish
Title of host publicationAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
EditorsRamón Navarro, James H. Burge
Place of PublicationBellingham, WA
Number of pages9
ISBN (Electronic)9781510602045
ISBN (Print)9781510602038
Publication statusPublished - 2016
Externally publishedYes
EventAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation II - Edinburgh, United Kingdom
Duration: 26 Jun 20161 Jul 2016

Publication series

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


OtherAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
Country/TerritoryUnited Kingdom

Bibliographical note

Copyright 2016 Society of Photo-Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.


  • Astrophotonics
  • High-resolution spectroscopy
  • Modal noise
  • Optical fibre
  • Photonic lantern
  • Slit refor-matting


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