Multi-Directional Fan Airflow for Extended Temperature Optical Modules
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Solution Overview
Problem
Conventional networking hardware with small form factor optical modules, such as CFP4 and QSFP, is limited to a temperature range of 0° C. to +70° C., restricting the operational range of networking hardware, as larger, expensive modules are required for extended temperature ranges.
Innovation Solution
Implementing a multi-directional fan system within the electronic chassis that adjusts airflow direction and temperature by using a first set of fans for high-temperature operation and a second set of fans, coupled with an air duct and heater, to provide preheated air for optical components in low-temperature operation, extending the temperature range from 0° C. to +65° C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If small form factor optical modules (CFP4, QSFP) are used, then hardware size and cost are reduced, but temperature range is limited to 0°C to +70°C
Solution Approach 1:
The patent implements dynamic airflow direction control using multiple fan sets that can switch between different operational modes. The system dynamically adjusts airflow patterns based on temperature conditions, directing warm air to optical modules during cold operation and reversing the flow during hot operation, thereby enabling small form factor modules to operate across an extended temperature range of -40°C to +65°C
Solution Approach 2:
The system changes the temperature parameter of air through active heating and cooling mechanisms. Heaters are used to warm air before it reaches optical modules in low-temperature environments, while fans and heat sinks dissipate heat in high-temperature environments, effectively extending the operational temperature range of the optical modules
2Temperature
If large form factor optical modules (CFP) are used, then extended temperature range (-40°C to +65°C) is supported, but hardware size and cost increase significantly
Solution Approach 1:
The system uses self-service thermal management where warm air generated by electronic components during normal operation is redirected to preheat optical modules when needed. The electronic components' heat, which would otherwise be wasted, is utilized to maintain optical module operating temperature, eliminating the need for external heating equipment and reducing overall system size
3Temperature
If large form factor optical modules (CFP) are used, then extended temperature range is supported, but system density is reduced
Solution Approach 1:
The patent segments the thermal management system into multiple independent fan sets (first fan set for cooling, second fan set for heating) that can operate independently. This segmentation allows each fan set to be optimized for its specific function and enables flexible configuration that maximizes system density while maintaining extended temperature range support
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
Enables small form factor optical modules to operate within an extended temperature range of −40° C. to +65° C., reducing hardware size and cost while maintaining system density and efficiency.
Implementation Method 1
The airflow in the first configuration can be provided by a first set of fans and the airflow in the second configuration can be provided by a second set of fans
Implementation Method 2
providing airflow in a second configuration, different from the first configuration, in low-temperature operation, wherein the airflow in the second configuration is directed to provide preheated air to one or more components
Implementation Method 3
The preheated air can be preheated by one or more of electronics in the electronic chassis and a heater
Implementation Method 4
The airflow in the second configuration can be provided first over heat-generating electronics before being provided to the one or more components, to heat the one or more components in the low-temperature operation
Data Source
AI summary
Systems and methods for providing airflow in an electronic chassis supporting operation in an extended temperature range for components therein include providing airflow in a first configuration in high-temperature operation; and providing airflow in a second configuration, different from the first configuration, in low-temperature operation, wherein the airflow in the second configuration is directed to provide preheated air to one or more components in the electronic chassis which support operation in a limited temperature range, to enable operation of the one or more components in the extended temperature range.