Laser-Written Glass Waveguides for 90-Degree Optical Routing
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Solution Overview
Problem
Existing optical systems face challenges in efficiently routing optical signals with complex geometries and high reflection efficiency, particularly for turning signals through large angles like 90 degrees, while maintaining a small footprint and integrating with standard optical packages.
Innovation Solution
The use of laser-modified glass waveguides with low-index regions or cavities, such as tubes or trenches, to create interfaces for total internal reflection, allowing flexible routing and alignment of optical signals with reduced optical losses and simplified integration with photonic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If lithographically defined waveguides with micromirror structures are used to route optical signals through large angles, then the optical signal can be redirected, but the reflection efficiency is limited and the footprint is increased
Solution Approach 1:
The patent transitions from planar 2D waveguide routing to 3D volumetric routing within the glass body. Multiple waveguides are embedded at different orientations and depths, enabling optical signals to be routed through large angles (e.g., 90 degrees) with high efficiency without increasing the planar footprint, as the routing occurs in the third dimension within the glass volume.
Solution Approach 2:
The patent replaces mechanical micromirror structures with laser-inscribed waveguide interfaces that utilize total internal reflection. This substitution eliminates the need for separate micromirror components and their associated alignment mechanisms, reducing the footprint while maintaining high reflection efficiency through precisely controlled refractive index modifications at the waveguide interfaces.
2Adaptability or versatility
If micromirror structures are fabricated using semiconductor-style wafer etching or mechanical blade dicing, then optical signals can be reflected, but the arrangement flexibility of waveguide and mirror geometries is restricted
Solution Approach 1:
The patent merges the waveguide formation and reflection interface creation into a single laser inscription process. The laser modifies the refractive index of the glass to form both the waveguide core and the reflective interfaces simultaneously, eliminating the need for separate micromirror fabrication steps and enabling flexible geometric arrangements without increasing manufacturing complexity.
Solution Approach 2:
The patent utilizes laser-induced refractive index changes in the glass body to create waveguides with flexible geometries. By controlling the laser parameters (power, speed, focus), various waveguide configurations and interface angles can be achieved within the same glass substrate, providing adaptability without requiring different fabrication processes for different geometries.
3Volume of moving object
If traditional waveguide platforms with planar waveguides are used, then optical signals can be transported horizontally, but routing signals in a small footprint vertically and horizontally is challenging
Solution Approach 1:
The patent embeds multiple waveguides at different orientations within the glass body, enabling optical signals to route in three dimensions. Waveguides can be arranged to transport signals horizontally and vertically within the same compact volume, achieving both small footprint and routing flexibility by utilizing the volumetric space rather than being constrained to planar surfaces.
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 approach enables compact, cost-effective, and efficient optical signal routing with flexible design options, reducing the number of components and minimizing optical losses, while allowing integration with other photonic components.
Implementation Method 1
The use of laser-modified glass waveguides with low-index regions or cavities, such as tubes or trenches, to create interfaces for total internal reflection
Data Source
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AI summary
An optical apparatus (10) for routing an optical signal (12) comprises a body (14) comprising a material. A waveguide (16) is formed in the body (14) by laser modification of the material. The optical apparatus (10) further comprises a region (18) comprising a lower refractive index than the material of the body (14) and defines an interface (24) between the region (18) and the waveguide (16). The waveguide (16) and the interface (24) are aligned relative to each other for routing the optical signal (12) therebetween and reflecting the optical signal (12) at the interface (24).