Active Optical Cable Plug-in Detection via Impedance Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing plug-in detection systems are not adaptable to optical fiber cables, as they rely on impedance sensing methods suitable for copper conductors and fail to function effectively with active optical cables (AOCs) that use optical fibers.
Innovation Solution
An optical cable system with a first optical fiber, a second optical fiber, a first mateable electrical connector, first switching circuitry, a first resistance network, and optical-to-electrical and electrical-to-optical signal conversion circuitry that switches impedance in response to detected optical signals, enabling plug-in detection in AOCs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If impedance sensing methods suitable for copper conductors are used, then plug-in detection works for copper cables, but the system cannot be adapted to optical fiber cables
Solution Approach 1:
The patent replaces the electrical impedance sensing mechanism (suitable for copper) with an optical signal detection mechanism. The host device detects the presence of the AOC by sensing optical signals transmitted through the optical fiber, rather than measuring electrical impedance. This substitution enables plug-in detection functionality to work with optical fiber cables while maintaining reliability.
Solution Approach 2:
The patent introduces an intermediary optical signal transmission path between the host device and the AOC. Instead of directly sensing electrical properties, the host device detects optical signals that mediate the connection status information. This intermediary approach bridges the gap between electrical detection methods and optical fiber technology.
2Reliability
If optical-to-electrical conversion circuitry is added to enable optical signal detection, then plug-in detection becomes possible in AOCs, but the device complexity increases
Solution Approach 1:
The optical-to-electrical conversion circuitry in the AOC serves multiple functions: it converts incoming optical signals to electrical signals for processing, and simultaneously generates detection signals that enable the host device to sense the connection status. This multi-functionality reduces the need for separate dedicated detection circuitry in the host device, thereby limiting the increase in overall system complexity.
Solution Approach 2:
The AOC's optical-to-electrical conversion circuitry automatically generates the detection signals needed for plug-in detection as part of its normal signal conversion operation. The circuitry serves itself by producing the necessary detection information during routine signal processing, eliminating the need for additional dedicated detection components in the host device.
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
Enables reliable plug-in detection in active optical cables, allowing for accurate determination of cable connection and initiation of data transmission tasks, similar to copper-based systems.
Implementation Method 1
first optical-to-electrical signal conversion circuitry configured to detect and convert a first optical receive signal received via the second optical fiber into a first electrical receive signal
Implementation Method 2
first electrical-to-optical signal conversion circuitry configured to convert the first electrical transmit signal into a first optical transmit signal and to provide the first optical transmit signal to the first optical fiber
Data Source
AI summary
An optical cable system includes switching circuitry, a resistance network, optical-to-electrical conversion circuitry, and electrical-to-optical conversion circuitry. The electrical-to-optical conversion circuitry can convert an electrical transmit signal into an optical transmit signal. When the optical-to-electrical conversion circuitry detects a received optical signal having an optical power exceeding a threshold, the optical-to-electrical conversion circuitry produces a switching signal that causes the switching circuitry to couple the resistance network to a terminal or other node associated with the electrical transmit signal, thereby changing the impedance at that node as perceived by plug-in detection circuitry of a device such as a computer or peripheral.