Modular TO-Can Header Assembly for Miniaturized Optical Transmitters
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Solution Overview
Problem
The reliability of miniature optoelectronic transmitters in optical data communications is compromised due to intricate manufacturing techniques, leading to increased manufacturing costs and inoperable devices, as functional testing often occurs after expensive components are installed, and size limitations cause positioning issues with optical and electrical components.
Innovation Solution
A TO-can design with a header assembly coupled to a substrate, incorporating a laser, beam steering device, and backreflection inhibitor, along with multiple electronic leads, allows for modular construction and incremental testing of optoelectronic components during manufacturing to ensure functionality before final assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If optoelectronic transmitters are miniaturized to meet size requirements, then device compactness is improved, but manufacturing reliability deteriorates due to intricate manufacturing techniques
Solution Approach 1:
The transmitter is divided into modular components (laser assembly, optical components, electrical components, housing) that can be manufactured separately and assembled systematically. This segmentation allows each component to be optimized independently while maintaining overall compactness, thereby improving manufacturing reliability without sacrificing miniaturization benefits.
Solution Approach 2:
Functional testing is performed at intermediate stages during assembly rather than only after complete assembly. This preliminary action enables early detection of manufacturing defects in miniaturized components, allowing for corrective measures before final assembly, thus improving manufacturing reliability while maintaining compact dimensions.
2Ease of manufacture
If functional testing is performed after complete assembly, then manufacturing process simplicity is maintained, but manufacturing cost increases due to expensive components being installed in inoperable devices
Solution Approach 1:
Burn-in testing and functionality checks are performed at intermediate assembly stages (e.g., after laser assembly installation, after optical component installation) rather than only after complete assembly. This preliminary action identifies defective units early, preventing waste of expensive components and assembly efforts on inoperable devices, thereby improving manufacturing cost efficiency while maintaining process simplicity through systematic testing checkpoints.
Solution Approach 2:
A feedback mechanism is implemented where test results from intermediate stages inform subsequent assembly decisions. Defective units are identified and removed from the production line before proceeding to the next assembly stage, preventing further investment in inoperable devices and improving overall manufacturing efficiency and cost-effectiveness.
3Volume of moving object
If optical and electrical components are positioned external to the header can, then space constraints are relieved, but electronic impedance and resistance matching problems increase
Solution Approach 1:
Optical and electrical components are integrated within the header can assembly rather than positioned externally. This merging of components into a compact integrated unit maintains space efficiency while allowing for precise control of electrical connections and impedance matching through carefully designed internal routing and mounting structures within the header can.
Solution Approach 2:
Components are arranged in three-dimensional space within the header can using vertical and radial positioning rather than only horizontal external placement. This dimensional reorganization allows components to be positioned optimally for both space utilization and electrical performance, maintaining impedance matching while relieving space constraints through sophisticated spatial arrangement.
4Ease of manufacture
If adhesive bonding materials are used to attach optical components to the TO-can, then component attachment is simplified, but optical path impedance increases
Solution Approach 1:
Adhesive bonding materials are eliminated from the optical path by using alternative attachment methods such as mechanical mounting structures, clips, or precision positioning mechanisms that hold optical components without requiring adhesives in the light path. This extraction of problematic materials maintains manufacturing simplicity while ensuring optimal optical signal transmission without impedance from bonding materials.
Solution Approach 2:
An intermediary mechanical mounting structure is introduced between the optical component and the TO-can housing, replacing direct adhesive bonding. This intermediary structure provides secure attachment while keeping the optical path clear of adhesive materials, thereby maintaining both manufacturing ease and optical signal integrity.
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 costs by identifying and discarding inoperable devices early, improving reliability, and enabling compact, efficient optical packages that meet standardized size requirements while maintaining performance.
Implementation Method 1
a beam steering device disposed on the substrate and oriented so as to receive the modulated optical signal from the laser and redirect the received beam along a second beam path that is substantially aligned with the optical signal axis
Implementation Method 2
a backreflection inhibitor disposed within the header can and positioned in the path of the modulated optical signal at one of the first beam path or second beam path, wherein the backreflection inhibitor serves to reduce or prevent reflection of emitted signals back to the transmitter
Data Source
AI summary
In one example configuration, an optical package includes a substrate that supports a laser. The laser is configured for electrical communication with circuitry disposed on the substrate, and the laser is arranged to emit an optical signal along a first path. The optical package also includes a beam steering device supported by the substrate and arranged so as to receive the optical signal from the laser along the first path. The beam steering device is configured such that the optical signal is output from the beam steering device along a second path. A group of electronic leads is provided that electronically communicates with the circuitry on the substrate. In this example, the group includes a set of modulation leads in electrical communication with the laser, and a set of bias leads in electrical communication with the laser. The set of bias leads is electrically isolated from the set of modulation leads.