Demonstration of multi-casting in a 1 × 9 LCOS wavelength selective switch

Brian Robertson, Haining Yang, Maura M. Redmond, Neil Collings, John R. Moore, Jinsong Liu, Anna M. Jeziorska-Chapman, Mike Pivnenko, Sharon Lee, Adrian Wonfor, Ian H. White, William A. Crossland, D. P. Chu

Research output: Contribution to journalArticlepeer-review

57 Citations (SciVal)


A multi-functional 1 × 9 wavelength selective switch based on liquid crystal on silicon (LCOS) spatial light modulator technology and anamorphic optics was tested at a channel spacing of 100 and 200 GHz, including dynamic data measurements on both single beam deflection and multi-casting to two ports. The multi-casting holograms were optimized using a modified Gerchberg-Saxton routine to design the core hologram, followed by a simulated annealing routine to reduce crosstalk at non-switched ports. The effect of clamping the magnitude of phase changes between neighboring pixels during optimization was investigated, with experimental results for multi-casting to two ports resulting in a signal insertion loss of-7.6 dB normalized to single port deflection, a uniformity of ±0.6%, and a worst case crosstalk of-19.4 dB, which can all be improved further by using a better anti-reflection coating on the LCOS SLM coverplate and other measures.

Original languageEnglish
Article number6678587
Pages (from-to)402-410
Number of pages9
JournalJournal of Lightwave Technology
Issue number3
Early online date5 Dec 2013
Publication statusPublished - 1 Feb 2014


  • Multi-casting
  • optical fiber communication
  • wavelength division multiplexing
  • wavelength selective switch

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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