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Tunable Fano resonance in a single-ring-resonator-based add/drop interferometer.
Kaiyang Wang1, Xiaoqi Liu, Changqiu Yu
1National Key Laboratory of Tunable Laser Technology, Institute of Opto-Electronics, Harbin Institute of Technology, Harbin, China.
Applied Optics
|July 16, 2013
Summary
This study demonstrates tunable Fano resonance in a ring resonator interferometer. Researchers controlled spectral line shapes and achieved box-like responses by adjusting coupling coefficients.
Area of Science:
- Photonics and optical engineering
- Quantum optics and Fano resonance phenomena
Background:
- Fano resonance offers sharp spectral features crucial for optical devices.
- Ring resonators are fundamental components in integrated photonics.
Purpose of the Study:
- To theoretically investigate tunable Fano resonance in a single-ring-resonator-based add/drop interferometer.
- To explore methods for controlling Fano resonance line shapes and spectral responses.
Main Methods:
- Theoretical analysis of light propagation and interference within a ring resonator.
- Modeling of an add/drop interferometer configuration.
- Investigation of coupling coefficients' influence on Fano resonance characteristics.
Main Results:
- Achieved tunable Fano resonance by controlling waveguide-ring coupling.
- Observed horizontally mirror-symmetric spectra at drop and through ports.
- Demonstrated the possibility of a box-like spectral response using double resonances.
- Showed that compensating phase difference can double the free spectral range.
Conclusions:
- The single-ring-resonator add/drop interferometer provides a versatile platform for tunable Fano resonance.
- Control over coupling coefficients enables precise shaping of optical spectra.
- Potential applications in optical filtering and signal processing.
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