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Compact high-Q multimode InGaAsP/InP microring resonators enabled by mode-selective excitation
Optics Express
|June 11, 2026
Summary
Researchers developed compact, high-quality factor InGaAsP/InP microring resonators (MRRs). This breakthrough suppresses scattering and bending losses, enabling advanced photonic integration for nonlinear applications.
Area of Science:
- Photonics and Optical Engineering
- Semiconductor Materials Science
- Integrated Optics
Background:
- Indium Gallium Arsenide Phosphide (InGaAsP) on Indium Phosphide (InP) is a key platform for photonic integration due to its nonlinear optical properties and active device compatibility.
- Small-radius InGaAsP microring resonators (MRRs) suffer from high scattering and bending losses, limiting their quality factor (Q).
Purpose of the Study:
- To demonstrate compact, high-Q InGaAsP/InP microring resonators (MRRs) suitable for advanced photonic applications.
- To overcome the limitations of scattering and bending losses in small-radius resonators.
Main Methods:
- Utilized mode-selective excitation in multimode resonators.
- Increased waveguide width to suppress sidewall scattering and bending losses.
- Employed phase-matched coupling conditions to mitigate intermodal coupling and ensure selective excitation of the fundamental transverse-electric mode.
Main Results:
- Achieved an intrinsic quality factor (Q_int) of 1.17 × 10^6 in an 80-µm-radius resonator.
- Measured a propagation loss of approximately 0.6 dB/cm at telecom wavelengths.
- Reported the highest intrinsic Q factor for InGaAsP/InP MRRs with sub-100-µm radii to date.
Conclusions:
- Demonstrated a practical method for fabricating compact, high-Q InGaAsP/InP microring resonators.
- The developed resonators are suitable for nonlinear photonic applications.
- This advancement paves the way for enhanced III-V semiconductor-based photonic devices.
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