Crossing Ring Resonator Filters for Compact Wavelength Detection
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Solution Overview
Problem
Existing ring-resonator filter devices face challenges in achieving a compact size while minimizing errors in the designed phase difference, which is crucial for precise wavelength detection in semiconductor laser devices.
Innovation Solution
The proposed ring-resonator filter device incorporates a waveguide with a core that forms two ring resonator filters with crossing ring-shaped portions, optimizing the design to minimize phase difference errors and achieve a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ring-resonator filter devices are used, then the device can perform wavelength detection, but the device size is large and phase difference errors are significant
Solution Approach 1:
The patent applies nesting by placing one ring resonator inside another ring resonator structure. The inner ring resonator is positioned within the loop of the outer ring resonator, allowing both resonators to share common optical path space. This nested configuration enables the device to maintain the required phase difference accuracy between multiple resonators while significantly reducing the overall device footprint compared to conventional separate ring resonator arrangements.
Solution Approach 2:
The patent transitions from a planar two-dimensional layout to a three-dimensional spatial arrangement by utilizing vertical stacking and nested configurations. The ring resonators are arranged in different spatial layers and positions, with the inner ring positioned within the loop of the outer ring. This dimensional change allows for more efficient space utilization and reduces the device area while maintaining optical performance.
2Area of stationary object
If the device is miniaturized, then the device size is reduced, but the phase difference error increases
Solution Approach 1:
By nesting the inner ring resonator within the outer ring resonator, the patent achieves compact miniaturization without compromising phase difference precision. The nested structure allows the resonators to be positioned in optimal spatial relationships, maintaining controlled phase differences even in the reduced device footprint. This configuration enables miniaturization while preserving manufacturing precision through geometric constraints inherent in the nested design.
Solution Approach 2:
The patent employs asymmetric design in the nested ring resonator configuration, where the inner and outer rings have different dimensions, positions, and orientations. This asymmetric arrangement allows for optimized phase difference control tailored to specific detection requirements, enabling the device to achieve high precision in a compact form factor by breaking symmetric constraints that would otherwise require larger dimensions.
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
This design enables the creation of a compact ring-resonator filter device with significantly reduced errors in phase difference, improving the accuracy of wavelength detection and enhancing manufacturing yield.
Implementation Method 1
a first ring-shaped waveguide portion and a second ring-shaped waveguide portion that cross each other
Data Source
AI summary
A ring-resonator filter device includes: a waveguide device that includes a core. Further, the core constitutes two ring resonator filters, each of the two ring resonator filters includes two arm portions, a ring-shaped portion, and two optical coupling/branching portions that optically couple the two arm portions and the ring-shaped portion, respectively, and the two ring-shaped portions cross each other.