Optical Module Angled Fin Layout for Compact Thermal Dissipation
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Solution Overview
Problem
Optical modules face challenges in fitting high-bandwidth components into a compact size while maintaining mechanical, optical, and thermal compliance, particularly due to fiber bend radius issues and inefficient thermal dissipation in high-power regions.
Innovation Solution
Positioning the optical subassembly at an angle within the module housing and using angled fins to enhance thermal dissipation, allowing for increased surface area and improved airflow without violating fiber bend radius constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the optical subassembly is positioned at an angle within the housing, then thermal dissipation is improved due to increased surface area of fins, but the device complexity increases due to angled positioning requirements
Solution Approach 1:
The optical subassembly is positioned at an angle (e.g., 45 degrees) relative to the housing instead of parallel, utilizing the depth dimension of the housing to create an angled configuration. This angular orientation enables the heat fins to extend at an angle, increasing their surface area and improving thermal dissipation without requiring the housing to be excessively large.
2Temperature
If heat fins are increased in surface area to improve cooling, then thermal dissipation is improved, but the device volume increases
Solution Approach 1:
Instead of increasing fin surface area by extending fins horizontally (which would increase device width), the fins are configured to extend vertically and at angles within the existing housing depth. This utilizes the unused vertical and angular space within the housing volume, increasing cooling surface area without expanding the device's external dimensions.
Solution Approach 2:
The heat fins are nested within the housing structure, with fins positioned in the space between the optical subassembly and the housing walls. The angled fin configuration allows them to nest efficiently within the available volume, maximizing surface area within the constrained space.
3Reliability
If the optical subassembly is positioned at an angle, then fiber bend radius requirements are met, but the manufacturing precision requirements increase
Solution Approach 1:
The optical subassembly is positioned at an asymmetric angle (e.g., 45 degrees) rather than symmetrically parallel to the housing. This asymmetric angular positioning naturally provides the necessary fiber bend radius by creating a more gradual fiber path, while the angle itself becomes a standardized design parameter that simplifies the positioning tolerance requirements.
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
The angled design reduces thermal penalties, lowers operating temperatures, and minimizes power consumption by optimizing airflow and fin geometry, while maintaining compliance with mechanical and optical standards.
Implementation Method 1
heat fins that are one or more of (1) located on the housing positioned near the optical subassembly, and (2) in contact with the optical subassembly
Implementation Method 2
angled fins to enhance thermal dissipation, allowing for increased surface area and improved airflow
Data Source
AI summary
An optical module includes a housing, an optical subassembly arranged at an angle relative to the housing, and a thermal dissipation structure on the housing. The angled orientation of the optical subassembly improves compliance with fiber bend radius requirements and enables fins of the thermal dissipation structure to be dimensioned in correspondence with the angle to provide increased surface area in regions of higher airflow. In some embodiments, the fins are disposed on a top side of the housing, and in other embodiments, the fins are disposed on a bottom side of the housing. The angled fin configuration enhances convective heat transfer while maintaining compact form factor compliance for pluggable modules such as QSFP-DD and OSFP coherent optics.