Optical Coupling Surface Fabrication via Laser-Induced Breakage
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Solution Overview
Problem
Conventional methods for fabricating optical systems often result in significant optical insertion loss due to large coupling gaps between optical waveguides and devices, which are caused by the protrusions created during substrate separation.
Innovation Solution
A laser-induced breakage technique is used to generate stressed regions within a substrate, allowing for precise separation and creating a minimal coupling gap between the optical waveguide and device, reducing or eliminating optical insertion loss by producing a substrate with little to no protrusion along the laser-induced breakage regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional substrate separation methods are used, then substrate separation is achieved, but large coupling gaps and protrusions are created causing significant optical insertion loss
Solution Approach 1:
The patent applies preliminary action by creating stressed regions within the substrate before separation using laser irradiation. These pre-formed stressed regions guide the subsequent breaking process to occur at precise locations, ensuring minimal protrusion and coupling gap without requiring post-processing adjustments
Solution Approach 2:
The patent replaces conventional mechanical substrate separation methods with a laser-induced breaking process. By using laser energy to create stressed regions and initiate controlled breakage, the method achieves superior precision and eliminates the large coupling gaps and protrusions that result from traditional mechanical separation techniques
2Loss of energy
If laser-induced breakage technique is used, then minimal coupling gap is achieved reducing optical insertion loss, but additional manufacturing steps are required
Solution Approach 1:
The patent merges the substrate separation process with the creation of precise breaking patterns by combining laser irradiation with mechanical tension application. This integrated approach achieves minimal coupling gaps while consolidating multiple operations into a unified manufacturing step, reducing overall process complexity despite the advanced technique employed
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 technique achieves a coupling gap of less than 10 micrometers, significantly reducing optical insertion loss and enabling efficient optical coupling with minimal insertion loss.
Implementation Method 1
transmitting a laser beam into the substrate to produce a stressed region in the substrate
Implementation Method 2
transmitting a laser beam into the substrate to produce a stressed region in the substrate
Implementation Method 3
generating, within the stressed region, a tension to produce a laser-induced breakage region
Data Source
AI summary
An optical system may include a substrate that includes an etched region and a laser-induced breakage region. The optical system may further include an optical waveguide disposed on the substrate. The optical system may further include an optical device coupled to the optical waveguide within the etched region. The laser-induced breakage region may produce a predetermined coupling gap between the optical waveguide and the optical device.