Optical Transmission Substrate Core Protrusion for Signal Loss
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Solution Overview
Problem
Existing optical transmission modules experience signal loss due to the significant distance between the photoelectric conversion element and the optical transmission line, which is not efficiently addressed by the cladding layer configuration in current opto-electric composite substrates.
Innovation Solution
The optical transmission substrate incorporates a wiring substrate with a specific configuration of optical transmission lines, including a first and second cladding portion, and an end portion with an inclined surface and groove, positioned to reduce the distance between the photoelectric conversion element and the core portion, enhancing optical connection and signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the photoelectric conversion element is mounted on the cladding layer in existing opto-electric composite substrates, then the element can be positioned on the substrate, but the distance between the element and the optical transmission line remains significant, causing signal loss
Solution Approach 1:
The patent introduces a vertical dimensionality change by forming the end portion of the core portion to protrude upward from the cladding layer surface. This three-dimensional configuration reduces the vertical distance between the photoelectric conversion element and the optical transmission line, thereby improving optical coupling efficiency and reducing signal loss without compromising structural integrity.
Solution Approach 2:
The patent applies local quality modification by creating a specific protruding end portion at the terminal region of the core portion where optical coupling occurs. This localized structural enhancement concentrates the optical field interaction at the end portion, improving coupling efficiency precisely where needed while maintaining the overall waveguide structure.
2Loss of energy
If the end portion of the optical transmission line is positioned closer to the photoelectric conversion element, then signal loss is reduced, but the complexity of the substrate structure increases
Solution Approach 1:
The patent segments the core portion into a main body and a distinct end portion, where the end portion is formed to protrude from the cladding layer. This segmentation allows independent optimization of the coupling region while maintaining the simplicity of the overall waveguide structure, reducing signal loss without proportionally increasing overall complexity.
Solution Approach 2:
The protruding end portion is formed as a preliminary structural feature during the substrate fabrication process, before the photoelectric conversion element is mounted. This preliminary action prepares the optical coupling interface in advance, ensuring optimal positioning and reducing the need for complex post-assembly adjustments.
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 configuration reduces signal loss by minimizing the distance between the photoelectric conversion element and the optical transmission line, improving the reliability and efficiency of optical signal transmission in the module.
Implementation Method 1
an optical waveguide including a core layer through which a light beam propagates and a cladding layer for coating the core layer
Data Source
AI summary
An optical transmission substrate of the disclosure includes a wiring substrate and an optical transmission line. The wiring substrate includes one main surface which includes a mounting area for a photoelectric conversion element. The optical transmission line includes a first cladding portion which is disposed on the one main surface of the wiring substrate and has a layer shape, at least one core portion which is disposed on the first cladding portion and has a strip shape, and a second cladding portion which is disposed on a part of the at least one core portion. The optical transmission line includes an end portion which is positioned in the mounting area. The end portion includes a part of the at least one core portion.