TOSA Feedthrough with Integrated LDD Mounting
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Solution Overview
Problem
Designing multi-channel optical transceiver modules with hermetically-sealed housings poses challenges in reducing volume while maintaining thermal dissipation, RF signal integrity, and power efficiency, especially when scaling beyond four channels, due to limitations in laser diode driver (LDD) chip capacity and the need for redundant components.
Innovation Solution
A multi-channel transmitter optical subassembly (TOSA) arrangement with a feedthrough device featuring integrated mounting surfaces allows for compact mounting of LDD chips and filtering capacitors within the hermetically-sealed housing, enabling thermal isolation and reduced power consumption by separating thermal conduction paths, thus optimizing space and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hermetically-sealed housings with arrayed waveguide gratings, temperature control devices, and laser packages are included to reduce loss and ensure optical performance, then optical performance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines multiple discrete components (LDD chips, filtering capacitors, laser packages, temperature control devices) into a single hermetically-sealed housing assembly. This integration reduces the number of separate manufacturing steps and assembly operations, thereby reducing manufacturing complexity while maintaining optical performance through the protected integrated structure.
Solution Approach 2:
The hermetically-sealed housing serves multiple functions simultaneously: it provides optical performance protection, thermal management, electrical isolation, and environmental sealing. This multi-functionality reduces the need for separate dedicated components, simplifying the overall manufacturing process while ensuring reliable optical operation.
2Productivity
If the number of channels is increased beyond four channels, then transmission capacity is improved, but thermal management becomes more difficult due to limitations in LDD chip capacity and need for redundant components
Solution Approach 1:
The patent segments the thermal management function by providing separate thermal conduction paths for different components within the housing. Heat-generating components such as LDD chips and laser packages have dedicated thermal pathways to heat sinks or cooling structures, preventing thermal accumulation and enabling higher channel counts without compromising thermal management.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement within the hermetically-sealed housing to optimize thermal management. By arranging components vertically and horizontally with dedicated thermal pathways in multiple directions, the design efficiently dissipates heat from multiple channels simultaneously, enabling increased transmission capacity beyond four channels.
3Reliability
If LDD chips and filtering capacitors are mounted on separate structures, then electrical isolation is improved, but space utilization decreases
Solution Approach 1:
The patent merges LDD chips and filtering capacitors onto a common internal mounting structure within the hermetically-sealed housing. This integrated mounting approach maintains electrical isolation between components through proper PCB design and grounding schemes while maximizing space utilization by eliminating the need for separate external mounting structures.
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 configuration enables the inclusion of additional optical components, reduces the overall length of the TOSA housing, improves thermal dissipation, and maintains RF signal quality, allowing for higher channel counts and transmission speeds while minimizing power consumption.
Implementation Method 1
enabling thermal isolation and reduced power consumption by separating thermal conduction paths
Data Source
AI summary
The present disclosure is generally directed to a multi-channel TOSA arrangement with a housing that utilizes a feedthrough device with at least one integrated mounting surface to reduce the overall dimensions of the housing. The housing includes a plurality of sidewalls that define a hermetically-sealed cavity therebetween. The feedthrough device includes a first end disposed in the hermetically-sealed cavity of the housing and a second end extending from the cavity away from the housing. The feedthrough device provides the at least one integrated mounting surface proximate the first end within the hermetically-sealed cavity. At least a first laser diode driver (LDD) chip mounts to the at least one integrated mounting surface of the feedthrough device. A plurality of laser arrangements are also disposed in the hermetically-sealed cavity proximate the first LDD chip and mount to, for instance, a LD submount supported by a thermoelectric cooler.