Optical Module Stepped Insulating Body Reduces Crosstalk
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical modules experience significant electrical crosstalk due to the close proximity of wiring patterns at the feedthrough portions, leading to malfunctions and noise, especially in high-speed multichannel systems.
Innovation Solution
The optical module incorporates a flexible wiring board with electrodes and pads of varying heights and orientations, ensuring that connecting portions between electrodes and pads are distant from each other, reducing crosstalk by using insulating bodies with stepped front edge surfaces and separate wiring patterns that cross each other, thereby maintaining the structural integrity and reducing electrical interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If wiring patterns are connected to feedthrough portions using conductive adhesive, then fixing strength is maintained, but crosstalk occurs due to close proximity of connecting portions
Solution Approach 1:
The patent applies dimensionality change by forming insulating protrusions that extend in the thickness direction of the flexible board, creating vertical separation between adjacent wiring patterns. This transforms the problem from a two-dimensional planar arrangement to a three-dimensional structure, where the insulating protrusions physically separate connecting portions in the vertical dimension, thereby reducing crosstalk while maintaining fixing strength through adequate bonding area.
2Strength
If conductor width is widened to increase bonding area, then fixing strength is improved, but crosstalk is caused due to closer proximity of wiring patterns
Solution Approach 1:
The patent resolves this contradiction by introducing insulating protrusions that extend vertically from the flexible board surface. These protrusions allow wiring patterns to maintain adequate horizontal bonding area for strong connections while providing vertical separation that prevents crosstalk. The insulating structures effectively use the thickness dimension to solve the two-dimensional crowding problem.
3Adaptability or versatility
If multiple wiring patterns are disposed on the same flexible board, then multichannel functionality is achieved, but crosstalk suppression is insufficient
Solution Approach 1:
The patent applies segmentation by dividing the flexible board into distinct regions for different channels, with insulating protrusions created between adjacent wiring patterns. This segmentation physically separates signal paths while maintaining integration on a single flexible board, enabling multichannel functionality with improved crosstalk suppression through the insulating structures.
Data Source
AI summary
An electrical interface includes an insulating body, first electrodes, and second electrodes. The insulating body includes a first front edge surface and a second front edge surface facing in a direction along a transmission direction of an optical signal at an optical interface and having different heights. The first electrode and the second electrode are provided on the insulating body so as to have a thickness from the first front edge surface and the second front edge surface in a direction of the height. A first flexible wiring board and a second flexible wiring board include a first area and a second area extending in directions along the first front edge surface and the second front edge surface, respectively, of the insulating body, and include, in the first area and the second area, first pads and second pads electrically connected with the first electrodes and the second electrodes.