Microring hOPO Phase Matching for Broad Coherent Wavelength Access
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Solution Overview
Problem
Current integrated photonics technologies face challenges in generating coherent laser light across a broad spectral range, with existing χ(3) OPO devices failing to simultaneously achieve high performance in wavelength access, conversion efficiency, and output power.
Innovation Solution
The development of a microresonator photonics OPO device using hybrid-mode optical parametric oscillation (hOPO) with a microring resonator configured to generate coherent light, employing silicon nitride and silicon dioxide materials, and achieving phase-matching through higher-effective-index modes, which suppresses competitive nonlinear processes and enhances conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional integrated photonics lasers are used, then laser light can be generated at specific wavelengths, but wavelength access across a broad spectral range is limited
Solution Approach 1:
The microring resonator is designed to perform multiple functions: it acts as both the nonlinear optical medium for wavelength conversion and the resonant cavity for enhancing interaction. By integrating the χ(3) nonlinear material directly into the microring structure, the device achieves broad wavelength access without requiring separate components for each function, thereby avoiding the complexity of integrating multiple material platforms.
Solution Approach 2:
The patent utilizes the tunable resonant frequencies of the microring cavities to access different wavelength bands. By changing the resonant parameters (quality factor Q, mode frequencies) of the cavities, the system can generate coherent light across a broad spectral range from visible to mid-infrared, achieving versatility through parameter optimization rather than structural complexity.
2Power
If χ(3) OPO devices are used for wavelength conversion, then coherent light can be generated at different wavelengths, but conversion efficiency and output power are insufficient
Solution Approach 1:
The patent combines multiple microring cavities with different quality factors and mode frequencies into a single integrated structure. The first cavity (higher Q) is optimized for signal generation while the second cavity (lower Q) is optimized for idler generation. This merging allows simultaneous enhancement of both signal and idler powers through coordinated resonant enhancement, achieving high conversion efficiency and output power that cannot be achieved with a single cavity.
Solution Approach 2:
The system dynamically adjusts the resonant conditions of the two cavities to optimize the parametric oscillation process. By tuning the pump frequency to match the resonant frequencies of both cavities simultaneously, the system maximizes the nonlinear interaction efficiency, enabling high conversion efficiency (>15%) and high output power (>10 mW) to be achieved together rather than traded off against each other.
3Reliability
If single-mode-family OPO is used, then the device structure is simple, but competitive nonlinear processes reduce performance
Solution Approach 1:
The patent segments the nonlinear optical process into two distinct resonant stages occurring in two separate cavities. The first cavity handles the primary parametric oscillation with high Q-factor for signal generation, while the second cavity manages idler generation with optimized lower Q-factor. This segmentation isolates the nonlinear processes spatially and temporally, preventing competitive nonlinear effects from interfering with each other, thereby improving reliability without requiring complex single-structure designs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The hOPO device achieves unprecedented performance with a pump-to-idler conversion efficiency of up to 29% and output idler power of >18 mW on-chip, enabling flexible coherent light generation across a broad range of wavelengths while maintaining high overall cavity quality.
Implementation Method 1
The microring resonator is configured to generate a coherent second color light and a coherent third color light. The generation of the coherent second color light and the coherent third color light are based on hybrid-mode optical parametric oscillation.
Implementation Method 2
achieving phase-matching through higher-effective-index modes, which suppresses competitive nonlinear processes and enhances conversion efficiency
Data Source
AI summary
A system for generating a coherent laser light includes a light source configured to pump a first color laser light and a device configured to generate a coherent second color light and a coherent third color light. The device includes a waveguide configured to couple to the light source and a microring resonator coupled to the light source via the waveguide. The microring resonator is configured to generate a coherent second color light and a coherent third color light. The generation of the coherent second color light and the coherent third color light is based on hybrid-mode optical parametric oscillation.