Optical Device Ring Waveguide Asymmetric Coupling Loss Reduction
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Solution Overview
Problem
Optical devices such as ring resonators and ring modulators face challenges in minimizing losses, particularly due to gap variations between waveguides affecting coupling loss and process sensitivity, and smaller circumference increasing bending loss, which impact modulation efficiency and extinction ratio.
Innovation Solution
The optical device design incorporates a ring waveguide with a taper-shaped coupler and an arc-shaped gap between the ring and bus waveguides, allowing for adjustable coupling ratios and reduced bending loss, along with a coupling material to enhance coupling strength and quality factor, and varying radii and widths to control interference conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the gap between waveguides is reduced to improve coupling loss, then coupling loss decreases, but process sensitivity increases
Solution Approach 1:
The patent employs asymmetric waveguide width design where the first waveguide has a different width than the second waveguide. This asymmetry allows optimization of the coupling gap independently for each waveguide, enabling reduced coupling loss while maintaining manufacturing tolerance. The asymmetric structure creates different mode profiles that enhance coupling efficiency without requiring extremely tight gap control.
Solution Approach 2:
The patent applies local quality by varying the width of waveguides at different locations. Specifically, the waveguide width is adjusted in the coupling region compared to other regions, allowing optimal coupling performance at the interface while maintaining standard dimensions elsewhere. This localized optimization reduces the sensitivity to overall manufacturing variations.
2Volume of moving object
If the circumference of the ring resonator is reduced to improve device compactness, then device size decreases, but bending loss increases
Solution Approach 1:
The patent implements local quality by varying the waveguide width along the ring resonator circumference. The waveguide width is increased in bending regions to reduce bending loss, while maintaining smaller overall device dimensions through optimized coupling regions. This localized dimension adjustment allows compact design without sacrificing performance.
Solution Approach 2:
The patent uses dynamically adjusted waveguide dimensions where the width varies continuously or in steps around the ring resonator. This dynamic geometry optimization allows the resonator to maintain small size while compensating for bending losses through wider sections at critical locations, achieving both compactness and low loss.
3Productivity
If the waveguide dimension is optimized to improve modulation efficiency, then modulation efficiency increases, but manufacturing tolerance decreases
Solution Approach 1:
The patent employs asymmetric waveguide dimensions where the first and second waveguides have different widths. This asymmetry is designed to achieve optimal evanescent field overlap for high modulation efficiency while being robust to manufacturing variations. The asymmetric design creates a coupling mechanism that is less sensitive to dimensional tolerances compared to symmetric designs.
Solution Approach 2:
The patent utilizes parameter changes by optimizing specific waveguide width ratios and gap dimensions to achieve high modulation efficiency. The design selects specific dimensional parameters that maximize the modulation effect while being tolerant to typical manufacturing variations, effectively decoupling performance optimization from tight tolerance requirements.
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 achieves high manufacturing tolerance, reduced coupling losses, improved quality factors, and enhanced modulation efficiency by optimizing the coupling structure and waveguide geometry, thereby addressing the limitations of existing devices.
Implementation Method 1
a gap between waveguides determines coupling loss, coupling ratio
Implementation Method 2
ring resonators and ring modulators
Data Source
AI summary
An optical device is provided. The optical device includes a ring waveguide and a bus waveguide. The ring waveguide includes a coupling region. The bus waveguide is disposed adjacent to and spaced apart from the coupling region of the ring waveguide. The bus waveguide includes a coupling structure corresponding to the coupling region.