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Updated: Jun 16, 2026
12:18
Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
Ultra-high order ring resonator system with sharp transmission peaks.
1School of Physical Science and Technology, Central South University, China.
Optics Express
|February 23, 2010
Summary
Researchers developed a novel relay ring resonator structure using cascaded microring resonators. This design achieves sharp transmission peaks, high rejection ratios, and extended group delays for optical signal processing.
Area of Science:
- Photonics
- Optical Engineering
- Materials Science
Background:
- Microring resonators are fundamental components in integrated photonics.
- Cascading resonators can enhance optical filter characteristics.
- Achieving sharp spectral features and high rejection ratios is crucial for advanced optical systems.
Purpose of the Study:
- To propose and demonstrate a novel relay ring resonator structure.
- To investigate the transmission response, including peak sharpness, out-of-band rejection, and group delay.
- To fabricate and validate the proposed structure using silicon nitride waveguides.
Main Methods:
- Designing a relay ring resonator structure with cascaded microring resonators.
- Utilizing the drop waveguide of one resonator as the input for the next.
- Fabricating a 90-microring resonator structure on silicon nitride wire waveguides.
- Conducting simulations and experimental measurements to verify performance.
Main Results:
- The proposed relay ring resonator structure exhibits sharp transmission peaks.
- High out-of-band rejection ratios were achieved.
- Long group delays were observed in the transmission response.
- Simulation and experimental results showed good agreement.
Conclusions:
- The relay ring resonator structure is an effective design for enhancing optical filter performance.
- This structure offers significant improvements in spectral sharpness and rejection.
- The demonstrated silicon nitride fabrication validates the potential for practical applications in integrated photonics.
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