Optical Waveguide Core Protection During Substrate Cutting
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Solution Overview
Problem
The existing manufacturing methods for optical waveguide devices result in core layers being damaged or contaminated during cutting, leading to signal noise and alignment issues during optical coupling with silicon waveguides due to exposed core layers being cut without proper protection.
Innovation Solution
The optical waveguide device is designed with a second clad layer comprising both uncured and cured photosensitive resin, where the uncured resin covers the core layer during cutting to prevent damage, and the cured resin covers other portions, ensuring flush end faces and protecting the core layers during processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the substrate is cut in a state in which optical coupling portions of the core layers are exposed, then the core layers can be accessed for optical coupling, but the core layers are contaminated by cutting scraps generated during the cutting
Solution Approach 1:
The patent applies preliminary action by forming a protective film on the core layers before the cutting process. This protective film is formed in advance to prevent contamination during subsequent cutting operations, allowing the core layers to be protected while still enabling access for optical coupling after the protective film is removed from specific regions.
Solution Approach 2:
The protective film acts as an intermediary between the core layers and the cutting process. It mediates the interaction by providing a barrier that prevents direct contact between cutting scraps and the core layers, while still allowing the cutting to proceed and enabling subsequent access to the optical coupling portions.
2Productivity
If the substrate is cut together with the core layers, then the substrate can be separated into individual pieces, but end portions of the core layers may be damaged
Solution Approach 1:
The patent applies beforehand cushioning by forming a protective film on the core layers before the cutting process. This protective film cushions the core layers during cutting, preventing direct damage to the end portions while allowing the substrate to be separated into individual pieces. The protective film absorbs the mechanical stress and prevents chips or cracks at the core layer ends.
3Adaptability or versatility
If the core layers are exposed for optical coupling, then optical coupling with silicon waveguides can be achieved, but alignment issues and signal noise occur due to damage or contamination
Solution Approach 1:
The patent applies preliminary action by forming a protective film on the core layers before any cutting or handling operations. This ensures that when the core layers are later exposed for optical coupling with silicon waveguides, they remain free from contamination and damage, thereby maintaining alignment accuracy and signal quality without interference.
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 prevents damage to the core layers during cutting and allows for reliable exposure of optical coupling portions, enabling effective optical coupling with silicon waveguides without signal interference or alignment issues.
Implementation Method 1
The second clad layer comprises an uncured photosensitive resin covering a first portion of the core layer, and a cured photosensitive resin covering a second portion of the core layer
Data Source
AI summary
An optical waveguide device is provided. The optical waveguide device includes: a substrate; a first clad layer formed on the substrate; a core layer formed on the first clad layer; and a second clad layer formed on the first clad layer so as to cover the core layer. The second clad layer includes an uncured photosensitive resin covering a first portion of the core layer, and a cured photosensitive resin covering a second portion of the core layer.