Fiber Optic Cable Coupling Assembly Using Passive Alignment
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Solution Overview
Problem
High-speed communication in data centers is limited by the physical layer medium and components, with Active Electrical Cables reaching a bandwidth and reach ceiling due to signal attenuation, and traditional Active Optical Cables being expensive due to high assembly costs and component costs.
Innovation Solution
A low-cost Active Optical Cable solution using integrated silicon-based photodiodes, transimpedance amplifiers, and VCSEL laser drivers with precision fiber alignment and automated signal optimization to achieve longer reach and higher bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional Active Optical Cables use high-quality optical engines and lasers for high bandwidth transmission, then bandwidth and reach performance is improved, but assembly cost and component cost increase significantly
Solution Approach 1:
The patent replaces expensive, specialized optical components (precision optical engines, high-cost lasers and photodiodes) with inexpensive, standard electronic components (off-the-shelf transceiver modules, standard electrical connectors). This substitution maintains adequate performance for data center applications while dramatically reducing component costs and assembly complexity.
Solution Approach 2:
The patent replaces complex mechanical optical alignment systems with simple electrical connector interfaces. Instead of requiring precision optical coupling and alignment procedures, the system uses standard electrical connectors that plug into transceiver modules, eliminating the need for expensive optical assembly equipment and skilled optical alignment technicians.
2Reliability
If Active Electrical Cables use parallel coaxial cables to increase bandwidth and reach, then signal transmission capability is improved, but physical size becomes bulky and power consumption increases
Solution Approach 1:
The patent replaces physical parallel coaxial cable assemblies with a single optical fiber coupled to electrical connectors. This substitution eliminates the need for multiple parallel cables, dramatically reducing the physical footprint and weight while maintaining high signal transmission capability through optical communication.
Solution Approach 2:
The patent changes the fundamental transmission medium from electrical signals in coaxial cables to optical signals in fiber optics. This parameter change enables higher bandwidth and longer reach without the physical constraints of parallel cable arrangements, while the use of standard electrical connectors maintains compatibility with existing electrical infrastructure.
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 solution enables a cost-effective Active Optical Cable with extended reach (up to 50 meters) and increased bandwidth (up to 800 Gbps) while reducing manufacturing and operational costs through integrated component design and single-step passive alignment.
Implementation Method 1
integrated silicon-based photodiodes or avalanche photodiodes with TIAs and VCSEL laser drivers
Implementation Method 2
vertical cavity surface emitting laser (VCSEL) laser drivers
Data Source
AI summary
Numerous examples are disclosed of a fiber optic cable coupling assembly and components thereof. In one example, a fiber optic cable coupling assembly comprises a coupling board containing a plurality of lasers and a plurality of photodiodes; and a mechanical-optical interface comprising a first plurality of ferrules and a plurality of lasers, where each laser in the plurality of lasers is aligned with a ferrule in the first plurality of ferrules; and a second plurality of ferrules and a plurality of photodiodes, wherein each photodiode in the plurality of photodiodes is aligned with a ferrule in the second plurality of ferrules.