Optical Module EMI Shielding via Localized Absorber Placement
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Solution Overview
Problem
In optical communication systems, high-frequency components in optical modules generate electromagnetic interference (EMI), which is challenging to mitigate without increasing costs, especially when multiple modules are densely mounted, requiring effective EMI shielding without using large electromagnetic wave absorbers.
Innovation Solution
The optical module design includes a circuit board with a high-frequency component operating at frequencies equal to or higher than a predetermined value and a low-frequency component on the opposite surface, with an electromagnetic wave absorber disposed on the upper surface of the low-frequency component, allowing for targeted EMI reduction without extensive absorber usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a large electromagnetic wave absorber is disposed inside the case to shield electromagnetic waves, then electromagnetic interference is reduced, but cost increases
Solution Approach 1:
The patent applies local quality by placing the electromagnetic wave absorber only on the upper surface of the low-frequency component that overlaps with the high-frequency component in plan view, rather than using a large absorber throughout the entire case. This localized placement targets the specific area where electromagnetic interference occurs between high-frequency and low-frequency components, reducing the quantity of absorber material needed while maintaining effective EMI shielding.
2Area of stationary object
If multiple optical modules are densely mounted on a network device, then space utilization is improved, but electromagnetic interference between modules increases
Solution Approach 1:
The patent implements local quality by confining the electromagnetic wave absorber to the specific region on the circuit board where high-frequency and low-frequency components overlap in plan view. This targeted approach provides effective EMI shielding for each module, enabling dense mounting of multiple modules on network devices without excessive interference between adjacent modules, thus improving space utilization.
3Object-affected harmful factors
If the electromagnetic wave absorber covers the entire low-frequency component surface, then EMI reduction effect is maximized, but device size and cost increase
Solution Approach 1:
The patent applies local quality by restricting the electromagnetic wave absorber to only the portion of the low-frequency component's upper surface that overlaps with the high-frequency component in plan view. This selective coverage maintains effective EMI reduction by targeting the specific interference zone while minimizing the absorber area, avoiding the need to cover the entire low-frequency component surface.
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 effectively reduces EMI radiation, achieving comparable results to larger absorber setups while minimizing costs and component size, with the largest reduction effect achieved when the absorber covers the entire low-frequency component surface, and significant effects maintained with smaller absorber areas.
Implementation Method 1
an electromagnetic wave absorber that is disposed on an upper surface of the low-frequency component
Data Source
AI summary
An optical module for transmitting an optical signal may include a circuit board on which electronic components are disposed, a high-frequency component that is disposed on a main surface of the circuit board and operates at a frequency equal to or higher than a predetermined reference value according to a frequency of the optical signal, a low-frequency component that is disposed on another main surface of the circuit board so as to overlap at least partly with the high-frequency component in a plan view and operates at a frequency less than the reference value, and an electromagnetic wave absorber that is disposed on an upper surface of the low-frequency component.