Low Profile Heatsink Attachment for Pluggable Optical Modules
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Solution Overview
Problem
Existing heatsink attachment methods for pluggable optical modules impede airflow and require modification to the optical module cages, particularly in systems with limited vertical space or front-to-back airflow, making them inefficient for thermal management in high-density networking equipment.
Innovation Solution
A low profile heatsink attachment method using a spring clip that connects to the side flanges of the heatsink, allowing independent attachment to a mounting block on the PCB without obstructing airflow, enabling reuse of existing cages and supporting various pluggable optical module formats like CFP, CFP2, CFP4, and OSFP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a traditional spring-loaded riding heatsink is used to ensure good thermal contact with the optical module, then heat dissipation effectiveness is improved, but airflow is blocked and cage modification is required
Solution Approach 1:
The spring clip is repositioned from a vertical orientation (blocking front-to-back airflow) to a horizontal orientation on the side flange (parallel to airflow), eliminating the harmful effect while maintaining thermal contact pressure
Solution Approach 2:
The spring clip is extracted from the traditional riding heatsink configuration and repositioned to the side flange, separating the airflow path from the spring mechanism while maintaining its clamping function
2Temperature
If a traditional riding heatsink with vertical spring clip is used, then thermal contact is improved, but device complexity increases due to cage modification requirements
Solution Approach 1:
The side flange-mounted spring clip design is universal and can be applied to existing cages without modification, making the heatsink attachment method compatible with various cage types (CFP, CFP2, CFP4, OSFP) without requiring custom modifications
Solution Approach 2:
The side flange structure of the heatsink itself provides the mounting location for the spring clip, eliminating the need for external cage modifications while maintaining effective thermal contact
3Object-generated harmful factors
If a low profile heatsink attachment method is used to eliminate airflow blockage, then airflow efficiency is improved, but heat dissipation effectiveness may be reduced
Solution Approach 1:
The spring clip is positioned locally on the side flange where it applies pressure perpendicular to the heatsink base, ensuring optimal thermal contact at the critical interface between the heatsink and optical module while maintaining airflow channels clear
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 eliminates airflow blockage, allows for efficient heat dissipation in both front-to-back and side-to-side airflow systems, and does not require modifications to the optical module cages, making it suitable for high-power, low-profile applications in constrained spaces.
Implementation Method 1
a low profile spring clip connecting the riding heatsink to the mounting block
Implementation Method 2
a riding heatsink disposed over the cage and connected to the mounting block... for dissipation of heat via airflow thereover
Implementation Method 3
dissipation of heat via airflow thereover
Data Source
AI summary
The present disclosure relates to a module for use in a network element comprising of a circuit board and a cage mounted on the circuit board where the cage is configured to support a pluggable optical module. The circuit board including a mounted block and a riding heatsink disposed over the cage and connected to the mounting block via a low profile spring clip. The riding heatsink includes a main body and side flanges having a height less than the main body, wherein the low profile spring clip connects to the side flanges. The riding heatsink includes a plurality of fins for dissipation of heat via airflow thereover, and low-profile spring clip has a height that does not obstruct any openings between the plurality of fins.