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Published on: February 6, 2014
Acousto-optic superlattice modulation in fiber Bragg gratings
1Department of Physics, University of Bath, Claverton Down, UK. p.s.j.russell@bath.ac.uk
Summary
We developed the theory for optical superlattices, combining fiber Bragg gratings and long-period gratings. This creates high-efficiency, narrow-band reflections for advanced fiber optic applications.
Area of Science:
- Optics
- Photonics
- Materials Science
Background:
- Fiber Bragg gratings (FBGs) and long-period gratings (LPGs) are fundamental components in fiber optics.
- Superposition of gratings can lead to novel optical phenomena.
- Acousto-optic modulators offer dynamic control over light propagation.
Purpose of the Study:
- To develop a detailed theoretical framework for optical superlattices.
- To analyze the behavior of superlattices in both acousto-optic and fixed-grating configurations.
- To explore potential applications of this grating superposition effect.
Main Methods:
- Theoretical modeling of coupled mode equations.
- Analysis of spectral characteristics of superimposed gratings.
- Consideration of acousto-optic effects on grating properties.
Main Results:
- Demonstrated that superposition of LPG and FBG induces high-efficiency, narrow-band reflections.
- Identified spectral peaks on either side of the Bragg wavelength.
- Validated theoretical predictions with experimental observations in acousto-optic modulators.
Conclusions:
- Optical superlattices offer a versatile platform for advanced photonic devices.
- The developed theory accurately describes the behavior of these structures.
- Potential applications span reconfigurable multiplexers, lasers, sensors, filters, modulators, and frequency shifters.
