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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
Analysis of coupled microcircular resonators coupled to a bus waveguide with high output efficiency
Shi-Jiang Wang1, Yue-De Yang, Yong-Zhen Huang
1State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, Beijing 100083, China.
Optics Letters
|June 16, 2010
Summary
Coupled microcircular resonators achieve high Q factors, significantly enhancing optical signal processing capabilities. This advancement offers superior performance compared to single resonators.
Area of Science:
- Photonics and optical engineering
- Nanophotonics
- Waveguide theory
Background:
- Microcircular resonators are key components in integrated photonics.
- Efficient coupling between resonators and waveguides is crucial for device performance.
- Previous studies focused on single resonators, limiting performance.
Purpose of the Study:
- To numerically investigate the optical properties of coupled microcircular resonators.
- To determine the Q factor and coupling efficiency of these coupled systems.
- To assess their suitability for optical signal processing applications.
Main Methods:
- Finite-difference time-domain (FDTD) technique for numerical simulation.
- Modeling of symmetrically coupled microcircular resonators and a bus waveguide.
- Analysis of optical modes, Q factor, and output coupling efficiency.
Main Results:
- Achieved a mode Q factor of approximately 10^5 for coupled resonators (refractive index 3.2, radius 2 microm, waveguide width 0.4 microm) at 243 THz.
- Calculated a high output coupling efficiency of 0.99 for modes with Q factors from 10^3 to 10^4.
- Demonstrated a Q factor two orders of magnitude higher than single coupled resonators.
Conclusions:
- Coupled microcircular resonators offer significantly enhanced Q factors compared to single resonators.
- The high Q traveling modes are well-suited for advanced optical signal processing.
- This research paves the way for more efficient integrated photonic devices.
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