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Research on FBG-based longitudinal-acousto-optic modulator with Fourier mode coupling method.

Zhuoxuan Li¹, Li Pei, Chao Liu

¹Key Laboratory of All Optical Network & Advanced Telecommunication Network of the Ministry of Education of China, Institute of Lightwave Technology, Beijing Jiaotong University, Beijing, China.

|October 24, 2012

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A new Fourier mode coupling model significantly enhances the efficiency of fiber Bragg grating (FBG) acousto-optic modulators. This model accurately predicts spectral properties, improving computational speed by 100x for FBG sensor applications.

Area of Science:

Photonics and Optical Engineering
Materials Science
Acoustics

Background:

Fiber Bragg Gratings (FBGs) are crucial for sensing and optical filtering.
Traditional analysis methods for FBG-based acousto-optic modulators can be computationally intensive.
Understanding the spectral properties under acoustic modulation is key for device optimization.

Purpose of the Study:

To apply and validate the Fourier mode coupling model for FBG-based longitudinal-acousto-optic modulators.
To numerically simulate and experimentally verify the spectral characteristics of these modulators.
To explore an efficient method for generating longitudinal acoustic waves for FBG modulation.

Main Methods:

Theoretical analysis and numerical simulation using the Fourier mode coupling model.

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Experimental modulation of a uniform FBG with acoustic waves at various frequencies.

Utilizing a conic silica horn and shear-mode PZT for longitudinal acoustic wave generation.

Main Results:

The Fourier mode coupling model demonstrated up to 100x improvement in computing efficiency compared to traditional methods.
Numerical simulations accurately predicted the spectral characteristics of the modulator.
Experimental results showed a good match with simulation data, validating the model's efficacy.

Conclusions:

The Fourier mode coupling model offers a highly efficient and accurate approach for analyzing FBG-based longitudinal-acousto-optic modulators.
The proposed method for generating longitudinal acoustic waves provides insights for optimal device design.
This work advances the development of high-performance FBG acousto-optic devices.