Ultrafast operation of Si thermo-optic switch using differential control method

Kohei Iino, Tomohiro Kita*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


To realize fast switching of a few μs and low-power consumption, we apply a differential control method to a thermo-optic Mach-Zehnder interferometer optical switch loaded with a direct-current injection-type phase shifter using multimode interference. We achieve ultrafast switching of several tens of ns, which is considerably higher than the conventional switching speed. With differential control, we demonstrate extremely fast optical switching with τ rise = 36 ns and τ fall = 24 ns. This method can be widely applied to similar devices and can contribute significantly to the speedup of other thermo-optic switches.

Original languageEnglish
Article number012002
JournalJapanese journal of applied physics
Issue number1
Publication statusPublished - 2023 Jan 1


  • optical switch
  • silicon photonics
  • thermo-optic effect

ASJC Scopus subject areas

  • General Engineering
  • General Physics and Astronomy


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