Optical Module Thermal Management via PCB Via Holes
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Solution Overview
Problem
High-power optical modules generate excessive heat due to high working frequencies, which cannot be efficiently dissipated using conventional methods like circuit boards or heat conductors, leading to potential performance degradation and reliability issues.
Innovation Solution
The optical module incorporates a heat dissipation layer on both surfaces of the circuit board with via holes filled with heat conductors, allowing for effective heat transfer from the laser driver and limiting amplifier to the exterior, while maintaining electrical connectivity and reducing thermal interference between components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the working frequency of the optical module is increased to achieve higher data transmission rates, then the productivity is improved, but the temperature generated by heat-generating components increases significantly
Solution Approach 1:
The heat dissipation system is segmented into multiple independent via holes distributed across the circuit board, each serving as an independent heat dissipation channel. This segmentation allows heat from different components (laser driver, limiting amplifier) to be dissipated through separate paths, improving overall heat dissipation efficiency while maintaining high working frequencies
Solution Approach 2:
The patent transitions from two-dimensional surface mounting to three-dimensional heat dissipation by drilling via holes through the entire circuit board thickness. This adds a vertical dimension (Z-axis) to heat dissipation, creating thermal conduction paths from the upper surface through the board to the lower surface, significantly increasing the heat dissipation area and efficiency
2Device complexity
If conventional heat dissipation methods (circuit board contact or heat conductor filling) are used, then the device complexity is kept low, but the heat dissipation efficiency is insufficient for high-power optical modules
Solution Approach 1:
Heat conductive material is introduced as an intermediary substance filling the via holes, mediating the heat transfer between the heat-generating components on the upper surface and the heat dissipation structures on the lower surface. This intermediary material enhances thermal conduction efficiency without significantly increasing device complexity
Solution Approach 2:
The circuit board structure is enhanced by combining the board material with heat conductive material in the via holes, creating a composite heat dissipation system. This composite approach leverages the electrical and mechanical properties of the circuit board while adding thermal conduction capabilities through the heat conductive material
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 solution enables rapid and efficient heat dissipation, reducing the temperature within the optical module and ensuring optimal operating conditions for the laser driver and limiting amplifier, thereby enhancing the module's performance and reliability.
Implementation Method 1
Each of the plurality of via holes is filled with a heat conductor, and the heat conductor is connected to the heat dissipation layers on the upper surface and the lower surface of the circuit board
Data Source
AI summary
This application discloses an optical module, including a circuit board, a lens assembly, a laser driver, and a limiting amplifier. Heat dissipation layers are disposed on the upper and lower surfaces of the circuit board. The laser driver and the limiting amplifier are mounted on the surface of the heat dissipation layer on the upper surface. Via holes are provided in projection regions of the laser driver and the limiting amplifier on the circuit board. Via holes penetrate the circuit board and are connected to the heat dissipation layers. Via holes are filled with a heat conductor, and the heat conductor is connected to the heat dissipation layers on the upper surface and the lower surface of the circuit board. The optical module disclosed in this application effectively dissipates heat generated by the laser driver and the limiting amplifier, thereby reducing the temperature in the optical module.