Optical USB Link for Long-Distance Signal Integrity
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Solution Overview
Problem
Existing USB communication systems face challenges in efficiently transmitting high-speed signals over long distances due to parasitic effects and electromagnetic interference, particularly in industrial and medical applications, where copper wires are inadequate, and previous optical fiber implementations are costly, power-intensive, and prone to noise issues.
Innovation Solution
A full-duplex optical communication link system that detects device connections, switches to low-power mode, and uses termination resistance control to ensure high-speed USB communication between a host and device via optical channels, supporting data rates up to 20 Gbps while minimizing noise and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If copper wire is used for USB communication, then short-distance transmission is achievable, but long-distance transmission efficiency deteriorates due to parasitic effects and electromagnetic interference
Solution Approach 1:
The patent replaces the electrical transmission system (copper wire) with an optical transmission system (optical fiber). The USB signals are converted from electrical domain to optical domain for transmission, eliminating the parasitic effects and electromagnetic interference inherent in copper wire transmission. This substitution enables long-distance transmission while maintaining signal integrity and transmission efficiency.
2Object-affected harmful factors
If optical fiber communication is implemented for USB signals, then electromagnetic interference is reduced, but implementation cost and power consumption increase
Solution Approach 1:
The patent designs the optical USB connector to be universally compatible with existing USB interfaces (USB3.0, USB3.1, USB3.2, USB4.0). The optical connector maintains the standard USB plug-and-play functionality while adding optical transmission capability. This multi-functionality allows the system to achieve electromagnetic interference reduction without requiring complete system redesign, thereby controlling implementation cost.
Solution Approach 2:
The patent introduces an optical conversion module as an intermediary between the USB host/device and the optical fiber transmission medium. This module handles the electrical-to-optical conversion and includes necessary signal processing functions. By isolating the complexity into a dedicated conversion module, the overall system implementation becomes more manageable and cost-effective.
3Length of stationary object
If optical fiber communication is used for USB signals, then transmission distance is extended, but power consumption increases
Solution Approach 1:
The patent implements a low-power mode where the optical transmission is activated only when USB signals need to be transmitted. The optical conversion module can enter a sleep or standby state when no data transmission is occurring, periodically activating only when needed. This periodic operation pattern extends transmission distance capability while significantly reducing average power consumption compared to continuous optical transmission.
4Speed
If USB signals are transmitted over optical fiber, then transmission speed is maintained, but noise suppression becomes challenging
Solution Approach 1:
The patent substitutes electrical signal transmission with optical signal transmission. Since optical signals are immune to electromagnetic interference and do not generate electromagnetic radiation, the fundamental source of noise in electrical USB communication is eliminated. The optical fiber medium itself acts as an intrinsic noise shield, maintaining high transmission speeds without susceptibility to external electromagnetic interference.
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 system enables reliable, high-speed, low-power, and cost-effective USB communication over long distances with reduced electromagnetic interference, ensuring compatibility and performance across USB3.0 to USB4.0 standards.
Implementation Method 1
USB signal transmission and reception between the host and the device may be performed via a bidirectional optical communication channel
Implementation Method 2
Detecting may include transmitting an electrical pulse through a reactive network, and detecting a change in a delay associated with the electrical pulse responsive to connecting the device circuit to the USB device
Data Source
AI summary
Methods for USB signal communication over an optical link are described. One aspect includes detecting connection of a device circuit to a USB device. The detecting may further include transmitting an electrical pulse through a reactive network, and detecting a change in a delay associated with the electrical pulse responsive to connecting the device circuit to the USB device. An optical signal associated with the detected connection may be transmitted to a host circuit via an optical communication channel.