High frequency in-core acousto-optic modulation of a suspended core optical fibre

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Abstract

The confinement of high frequency acoustic waves inside a suspended core fibre (SCF) is numerically investigated for the first time. A 500 μm long acoustic cavity, based on a four-hole SCF, is designed, simulated and evaluated by using the finite element method. The cavity is acoustically excited in the frequency range of 50 - 56 MHz and the induced displacements are integrated along the fibre. A standard single mode fibre is simulated under the same conditions for comparison. The results show strong Lamb acoustic modes oscillating in the silica bridges and overlapping in the SCF core at the resonance of 52.84 MHz. The induced displacement achieves a maximum in the core centre decaying to an almost null value in the cladding. The acoustic wave concentration in the SCF core is 13 times higher compared to the standard fibre, indicating a promising solution to overcome the frequency limitation of the current all-fibre acousto-optic devices. The modulation efficiency is increased without reducing the fibre diameter, making the devices more stable, fast and suitable to modulate all-fibre lasers.

Original languageEnglish
Article number113550G
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume11355
DOIs
Publication statusPublished - 1 Apr 2020
EventMicro-Structured and Specialty Optical Fibres VI 2020 - None, France
Duration: 6 Apr 202010 Apr 2020

Bibliographical note

Copyright 2020 SPIE. One print or electronic copy may be made for personal use only. Systematic reproduction, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

Keywords

  • Acoustic cavity
  • Acousto-optic devices
  • Lamb acoustic waves
  • Suspended core fibre

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