Optical Subassembly Thermal Management Without Hermetic Sealing
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Solution Overview
Problem
Hermetically-sealed housings in optical subassembly modules increase manufacturing complexity and cost, while also limiting the ability to efficiently manage thermal conditions, which can lead to condensation and performance degradation in optical transceiver modules.
Innovation Solution
Implementing a thermal management system that thermally couples heat-generating components, such as laser assemblies, directly to a thermoelectric cooler without a hermetically-sealed housing, using an external HVAC system to maintain ambient temperature and a heater device integrated into the laser submount to control temperature, thereby minimizing condensation risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hermetically-sealed housings are implemented to protect components from condensation, then reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the hermetically-sealed housing from the system and replaces it with a non-sealed housing combined with active thermal management components (thermoelectric cooler and heater). This removes the complexity of hermetic sealing while maintaining protection from condensation through temperature control.
Solution Approach 2:
The patent changes the approach from passive protection (hermetic sealing) to active control by monitoring and adjusting temperature parameters. The thermoelectric cooler and heater dynamically adjust temperature to prevent condensation, replacing the static hermetic barrier with a dynamic thermal control system.
2Reliability
If hermetically-sealed housings are used to prevent condensation, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent removes the expensive hermetically-sealed housing and replaces it with standard non-sealed housing plus relatively inexpensive thermal management components (thermoelectric cooler, heater, and temperature sensor), thereby reducing manufacturing cost while maintaining condensation prevention capability.
Solution Approach 2:
The patent uses relatively simple and inexpensive components (standard housing, thermoelectric cooler, heater, temperature sensor) that can be easily manufactured and replaced, replacing the expensive and complex hermetically-sealed housing while achieving the same functional outcome.
3Reliability
If hermetically-sealed housings are implemented, then protection from condensation is improved, but ease of manufacture deteriorates due to increased complexity
Solution Approach 1:
The patent extracts the complex hermetic sealing process from the manufacturing workflow and replaces it with simpler assembly steps involving mounting standard components (thermoelectric cooler, heater, temperature sensor) in a non-sealed housing, thereby improving ease of manufacture.
Solution Approach 2:
The patent segments the thermal management function into separate, modular components (thermoelectric cooler, heater, temperature sensor) that can be manufactured and tested independently, then assembled into the housing. This modular approach simplifies manufacturing compared to the integrated hermetic sealing process.
4Device complexity
If thermal management is implemented without hermetic sealing, then device complexity is reduced, but temperature control capability must be improved
Solution Approach 1:
The patent uses a temperature sensor to monitor the internal housing temperature and a control circuit to adjust the heating or cooling power accordingly. This closed-loop control ensures precise temperature management, compensating for the absence of hermetic sealing and maintaining temperature control precision.
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 approach reduces manufacturing complexity and cost by eliminating the need for hermetically-sealed housings while effectively managing thermal conditions, maintaining optimal temperatures for optical components, and preventing condensation within the optical transceiver module.
Implementation Method 1
thermally couples heat-generating components, such as laser assemblies, directly to a thermoelectric cooler
Implementation Method 2
a heater device integrated into the laser submount to control temperature
Data Source
AI summary
The present disclosure is generally directed to techniques for thermal management within optical subassembly modules that include thermally coupling heat-generating components, such as laser assemblies, to a temperature control device, such as a thermoelectric cooler, without the necessity of disposing the heat-generating components within a hermetically-sealed housing. Accordingly, this arrangement provides a thermal communication path that extends from the heat-generating components, through the temperature control device, and ultimately to a heatsink component, such as a sidewall of a transceiver housing, without the thermal communication path extending through a hermetically-sealed housing/cavity.