Waveguide Uniform Cure via Laser Beam Convolution Compensation
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Solution Overview
Problem
Optical losses in optical waveguides on printed circuit boards are significant due to uneven curing profiles caused by exposure convolution during laser direct writing, leading to refractive index mismatches between waveguide segments.
Innovation Solution
A convolution compensator is used to modify the laser beam spot profile, compensating for exposure convolution by adjusting the intensity and shape profiles to ensure a uniform cure profile across waveguide segments, thereby reducing optical losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser direct writing is used to fabricate waveguides, then manufacturing efficiency is improved, but exposure convolution causes non-uniform curing profiles leading to refractive index mismatches and optical losses
Solution Approach 1:
The patent applies preliminary anti-action by pre-calculating and applying a compensatory intensity distribution that counteracts the expected exposure convolution effects. The system determines a non-uniform intensity profile in advance that, when convolved with the system point spread function, produces the desired uniform cure profile, thereby preventing refractive index mismatches before they occur.
Solution Approach 2:
The patent changes the intensity distribution parameter of the laser beam from uniform to non-uniform. By modifying the intensity profile across the beam cross-section according to a calculated compensation function, the system transforms the exposure convolution effect from harmful to beneficial, achieving uniform curing while maintaining high manufacturing efficiency.
2Device complexity
If conventional laser beam profiles are used, then device complexity is minimized, but optical losses increase due to refractive index mismatches between waveguide segments
Solution Approach 1:
The patent modifies the intensity distribution parameter of the laser beam profile to create a non-uniform intensity distribution. This parameter change enables the beam to compensate for exposure convolution effects, ensuring uniform refractive index across waveguide segments and eliminating optical losses due to index mismatches.
Solution Approach 2:
The patent implements a feedback mechanism where the system characterizes its own point spread function and exposure convolution behavior, then uses this information to calculate and apply the appropriate compensatory intensity profile. This closed-loop approach ensures optimal beam shaping that minimizes optical losses while maintaining manufacturing efficiency.
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 solution results in waveguides with consistent and accurate refractive index profiles, reducing optical losses and improving the performance of waveguides with varying bend radii, especially those near critical bend radii.
Implementation Method 1
The photo-curable layer is cured along the waveguide segment with the modified beam portion of the laser beam
Data Source
AI summary
A waveguide includes a segment with a substantially uniform cure profile 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 a substantially uniform cure profile in the waveguide. 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 characteristics of the laser beam spot profile. A convolution compensator is positioned in the path of the laser beam to modify the beam spot profile during writing to form the one or more segments of the waveguide in a photo-curable layer.