TO Header Pedestal Layout for Low-Loss RF Optoelectronics
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Solution Overview
Problem
Existing transistor outline headers for laser diodes suffer from RF performance losses due to angled connections between the header and pedestals, which cause signal degradation, and require complex via structures for improved RF performance, complicating the assembly process.
Innovation Solution
A header design with electrically isolated pins and pedestals attached to the base using conductive materials, allowing for precise adjustment and elimination of offsets, and incorporating symmetrical pedestals with bars for improved RF performance and electromagnetic shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two separate RF lines with printed wire boards on pedestals are used to connect to the DML, then RF signal transmission is enabled, but the angled connection edges cause offsets between the header and printed wire boards leading to significant RF performance loss
Solution Approach 1:
The invention divides the connection structure into separate functional elements: the header base with openings and the pedestals with mounting surfaces. This segmentation allows each component to be optimized independently - the header base provides precise positioning features while the pedestals provide stable mounting for the printed wire boards, eliminating the connection offset problem that occurs when these functions are combined in a single stamped piece.
Solution Approach 2:
The invention introduces an intermediary connection structure consisting of the header base with precisely positioned openings and the pedestals that bridge the gap between the header and the printed wire boards. This intermediary structure eliminates the direct angled connection that causes offsets, providing a flat, precise mounting surface for the RF signal lines while maintaining electrical connection through the pin openings.
2Reliability
If vias are added to printed wire boards to enable GSG bond wire configuration for improved RF performance, then RF performance is enhanced, but production steps are increased and overall design is complicated
Solution Approach 1:
The invention merges the grounding function directly into the pedestal structure by making the pedestals electrically conductive and connecting them to the header base. This integration eliminates the need for separate via holes in the printed wire boards to establish ground connections, as the pedestal itself provides the ground path. The GSG configuration is achieved through the structural design rather than additional production steps.
Solution Approach 2:
The pedestals serve multiple functions simultaneously: they provide mechanical support for the printed wire boards, establish electrical ground connections through their conductive material, and enable the GSG bond wire configuration. This multi-functionality eliminates the need for separate via structures that would otherwise be required to achieve the same grounding and positioning functions.
3Ease of manufacture
If pedestals and header base are made in one stamping process as one piece, then manufacturing is simplified, but angled connection edges are created causing offsets and RF performance loss
Solution Approach 1:
The invention segments the header assembly into two separately manufactured components: the header base and the pedestals. This allows each component to be manufactured using optimal processes - the header base can be precision-machined or molded to provide accurate opening positions, while the pedestals can be separately fabricated with flat mounting surfaces. The separation eliminates the angled edges inherent in single-piece stamping while maintaining manufacturing efficiency.
Solution Approach 2:
The invention introduces an intermediary connection interface between the header base and pedestals, consisting of precisely positioned openings in the header base and corresponding mounting surfaces on the pedestals. This intermediary structure serves as a precision interface that eliminates the angled connection problems of single-piece construction while allowing both components to be manufactured separately with high 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
The design enhances RF performance by minimizing signal losses and simplifying assembly, reducing production complexity while maintaining effective electrical connections.
Implementation Method 1
The pedestal mounting face of the pedestal is fixedly attached to the base front face with an electrically conductive material that is at least partially arranged between the base front face and the pedestal mounting face
Implementation Method 2
An electrically isolating material, e.g. glass is arranged in the opening and in particular between the base and the pin to guarantee, that the pin is electrically isolated from the base
Implementation Method 3
The pedestal mounting face of the pedestal is fixedly attached to the base front face with an electrically conductive material that is at least partially arranged between the base front face and the pedestal mounting face
Data Source
AI summary
A header for opto-electronic applications is provided. The header includes a header base with a back face, a front face, and opening that extends from the back face through the base to the front face. The opening accommodates an electrically isolated pin through the opening. A pedestal is arranged at the front face and is below a center of the opening. The pedestal has a mounting face and a free face, which opposes the mounting face. The pedestal further includes an upper surface for mounting and carrying a pedestal submount. The mounting face is fixedly attached to the front face with an electrically conductive material that is at least partially arranged between the front face and the mounting face. An electrically isolating material is arranged in the opening between the base and the pin to electrically isolate the pin from the base.