Pluggable Optics Thermal Module With Lever-Protected Heat Interface
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Solution Overview
Problem
Current methods for cooling and heating high power optics in outdoor telecommunications products fail to efficiently remove elemental high power optics in outdoor telecommunications products fail to efficiently cool and heat high power optics in extended ambient temperatures without damaging thermal interfaces.
Innovation Solution
A node module assembly with a printed circuit board, thermoelectric coolers, and a vapor chamber thermally coupled to heat pipes, using a hinged lever mechanism to maintain thermal contact during insertion and removal of pluggable optical modules, enabling cooling and heating via natural convection without fans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If dry sliding interface is used for pluggable optics and heatsinks, then ease of insertion and removal is improved, but thermal contact interface becomes damaged adding thermal resistance
Solution Approach 1:
A thermal interface material (TIM) is introduced as an intermediary layer between the pluggable optics and the heatsink. This TIM layer protects the thermal interface from damage during insertion and removal operations while maintaining effective thermal contact. The TIM acts as a mediator that allows mechanical operation without direct metal-to-metal contact that would cause damage.
Solution Approach 2:
The thermal interface material is applied beforehand to the heatsink surface before inserting the pluggable optics. This pre-applied cushioning layer prevents direct contact between mating surfaces during insertion/removal operations, protecting the thermal interface from mechanical damage while still allowing effective heat transfer during operation.
2Device complexity
If natural convection cooling is used for high power optics, then device complexity is reduced by eliminating fans, but cooling capacity is limited to about 6.5 W
Solution Approach 1:
The cooling system uses a composite approach combining multiple heat transfer mechanisms: conduction through the heatsink and TIM, natural convection in the enclosure, and radiation from the heatsink fins. This composite heat transfer system achieves higher cooling capacity (25W+) without mechanical fans by optimizing the integration of these passive heat transfer modes.
Solution Approach 2:
The heatsink design extends heat dissipation into multiple spatial dimensions with fin structures that increase surface area in the vertical and lateral directions. This dimensional expansion of the heat dissipation surface enables higher cooling capacity through enhanced natural convection and radiation without adding mechanical complexity.
3Adaptability or versatility
If pluggable optical modules are inserted and removed repeatedly, then adaptability is improved, but thermal interface damage occurs increasing thermal resistance
Solution Approach 1:
The thermal interface material serves as a protective intermediary that absorbs mechanical stresses during repeated insertion and removal operations. This mediator layer maintains consistent thermal contact properties over many mating cycles, protecting the underlying thermal interface structures from wear and damage.
Solution Approach 2:
The thermal interface material properties (viscoelasticity, compliance) are optimized to accommodate repeated mechanical cycling. The material's physical parameters allow it to deform during insertion/removal and recover, maintaining thermal contact integrity through multiple operational cycles without permanent damage.
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
Effectively cools and heats high power optics up to 25 W using natural convection, preventing damage to thermal interfaces during module insertion and removal, and maintaining optimal operating temperatures across varying ambient conditions.
Implementation Method 1
a vapor chamber thermally coupled to one or more heat pipes and a remote heat spreader plate
Implementation Method 2
one or more heat pipes thermally coupled to a remote heat spreader plate
Implementation Method 3
one or more of a thermoelectric cooler disposed between and thermally coupled to the local heat spreader plate and the vapor chamber
Implementation Method 4
one or more of a thermoelectric cooler and a heater disposed between and thermally coupled to the local heat spreader plate and the vapor chamber
Implementation Method 5
a local heat spreader plate disposed adjacent and thermally coupled to the vapor chamber
Implementation Method 6
a hinged lever and plunger mechanism that allows the one or more POMs to be inserted into/removed from the one or more POM cages without damaging the thermal contact interface
Data Source
AI summary
An outdoor telecommunications enclosure that includes a node module assembly that serves to receive, retain, and effectively cool/heat one or more pluggable optical modules (POMs). The node module assembly includes a printed circuit board (PCBA) including one or more POM cages that are pressed over a local heat spreader plate, one or more thermoelectric coolers (TECs) and/or heaters, and a vapor chamber (VC) thermally coupled to one or more heat pipes and a remote heat spreader plate. Movement of the PCBA and one or more POM cages towards/away from the local heat spreader plate and one or more TECs/heaters is enabled by a hinged lever and plunger mechanism that allows the one or more POMs to be inserted into/removed from the one or more POM cages without damaging the thermal contact interface between the components.