Laser Direct Writing Non-Linear Waveguides Convolution Compensation
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Solution Overview
Problem
Optical losses in optical waveguides on printed circuit boards are significant due to mismatches in refractive index profiles between segments with different bend radii, caused by exposure convolution during the laser direct writing process, leading to uneven curing and refractive index variations.
Innovation Solution
A method and system that modify the laser beam spot profile using a convolution compensator to compensate for exposure convolution, ensuring a consistent cure profile across segments with varying bend radii by adjusting the intensity and shape of the laser beam based on geometric properties, thereby reducing optical losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a standard laser beam spot profile is used for laser direct writing, then the fabrication process is simple and fast, but the refractive index profiles between segments with different bend radii are inconsistent, causing optical losses
Solution Approach 1:
The convolution compensator pre-modifies the laser beam spot profile before writing each waveguide segment. By calculating the required compensation based on the segment's bend radius and applying it in advance through the compensator, the system ensures consistent refractive index profiles without requiring post-processing or complex real-time adjustments during writing.
Solution Approach 2:
The laser beam spot profile is customized for each specific waveguide segment based on its local geometric properties, particularly its bend radius. The convolution compensator applies different intensity distributions tailored to each segment's curvature requirements, ensuring optimal curing and refractive index consistency for that specific location rather than using a universal beam profile.
2Productivity
If laser direct writing is used for rapid waveguide fabrication, then productivity is high, but exposure convolution causes uneven curing and refractive index variations
Solution Approach 1:
The system takes the inherent exposure convolution effect, which normally causes uneven curing, and converts it into a beneficial tool. By deliberately shaping the laser beam spot profile to counteract the expected convolution based on waveguide geometry, the system achieves uniform curing and consistent refractive index profiles while maintaining the high-speed advantages of laser direct writing.
3Ease of manufacture
If segments with different bend radii are written using the same laser parameters, then the fabrication process is simple, but optical losses increase due to refractive index mismatches
Solution Approach 1:
The laser beam spot profile is dynamically adjusted for each waveguide segment based on its bend radius. The convolution compensator modifies the intensity distribution in real-time according to the specific geometric requirements of each segment, ensuring optimal curing conditions and refractive index consistency. This dynamic adaptation maintains high optical transmission performance without significantly complicating the overall fabrication workflow.
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 approach results in waveguides with reduced optical losses by achieving consistent refractive index profiles and cure profiles, improving the accuracy and performance of optical waveguides on printed circuit boards.
Implementation Method 1
A photo-curable layer is cured along the non-linear waveguide segment with the modified beam portion of the laser beam
Data Source
AI summary
A waveguide includes multiple segments having different bend radii with substantially consistent cure profiles and related methods and systems for making and using the same. The waveguide is formed by modifying a laser beam used to write the waveguide to provide the consistent cure profile in the multiple segments. A marker characteristic of laser writing may be present in the waveguide. A method or system modifies an intensity profile or a shape profile of a laser beam to proactively compensate for exposure convolution based on the geometry of each waveguide segment. A convolution compensator is positioned in the path of the laser beam to modify the beam spot profile during writing to form the multiple segments of the waveguide in a photo-curable layer.