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Bending effect on fiber acousto-optic mode coupling
Jianhui Zhao1, Xiaoming Liu, Yan Wang
1Department of Electronic Engineering, Tsinghua University, Beijing 100084, China. zhaojh01@mails.tsinghua.edu.cn
Applied Optics
|August 27, 2005
Summary
Bending optical fibers introduces new acousto-optic peaks by breaking mode symmetry. Peak strength and wavelength shifts depend on bending curvature and orientation relative to acoustic waves.
Area of Science:
- Optics and Photonics
- Acousto-Optics
- Fiber Optics
Background:
- The acousto-optic effect describes light modulation by acoustic waves.
- Fiber optic devices are crucial for telecommunications and sensing.
- Understanding mode coupling in bent fibers is key to advanced optical applications.
Purpose of the Study:
- To investigate the acousto-optic effect in bent optical fibers.
- To analyze the impact of fiber bending on mode coupling and transmission spectra.
- To explore the relationship between bending curvature, orientation, and spectral shifts.
Main Methods:
- Experimental measurements of transmission spectra in bent fibers.
- Numerical simulations using the scalar finite-element method.
- Analysis of mode spatial symmetry breaking and its consequences.
Main Results:
- New mode-coupling peaks were observed in the transmission spectra of bent fibers.
- The appearance of these peaks is attributed to the breaking of mode spatial symmetry.
- Peak strength increased with fiber bending curvature, showing wavelength redshifts or blueshifts.
- Spectral shifts were highly dependent on the fiber bending orientation relative to acoustic wave vibration.
Conclusions:
- Fiber bending significantly alters acousto-optic interactions by breaking mode symmetry.
- The observed spectral features offer potential for novel fiber optic sensing and modulation.
- Precise control over bending parameters can tune the acousto-optic response.