Mid-infrared all-optical modulators based on an acetylene-filled hollow-core fiber

Kaiyuan Zheng, Shoulin Jiang, Feifan Chen, Yan Zhao, Shoufei Gao, Yingying Wang, Hoi Lut Ho, Wei Jin

Research output: Journal article publicationJournal articleAcademic researchpeer-review

7 Citations (Scopus)


We report all-optical mid-infrared phase and intensity modulators based on the photo-thermal effect in an acetylene-filled anti-resonant hollow-core fiber. Optical absorption of the control beam promotes the gas molecules to a higher energy level, which induces localized heating through non-radiative relaxation and modulates the refractive index of the gas material and hence the accumulated phase of the signal beam propagating through the hollow-core fiber. By modulating the intensity of the control beam, the phase of the signal beam is modulated accordingly. By use of a 1.53 μm near-infrared control beam, all-optical phase modulation up to 2.2π rad is experimentally demonstrated at the signal wavelength of 3.35 μm. With the phase modulator placed in one arm of a Mach-Zehnder interferometer, intensity modulation with on-off ratio of 25 dB is achieved. The gas-filled hollow-core-fiber modulators could operate over an ultra-broad wavelength band from near-to mid-infrared and have promising application in mid-infrared photonic systems.

Original languageEnglish
Article number50
JournalLight: Advanced Manufacturing
Issue number4
Publication statusPublished - 2022


  • Hollow-core fiber
  • Mach-Zehnder interferometer
  • Mid-infrared
  • Optical phase modulator
  • Photothermal effect

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Materials Science (miscellaneous)
  • Metals and Alloys
  • Instrumentation


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