Hybrid Optical-Electrical Cable for HDMI Signal Integrity
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Solution Overview
Problem
Conventional HDMI cables face significant signal distortion at longer lengths, limiting their practical use, and lack the ability to provide power or indicate power availability, while also requiring effective alignment and bias voltage for optical components like VCSELs and PDs.
Innovation Solution
A hybrid data communication cable medium using optical waveguides for high-speed data and electrical wires for low-speed data and power, with multiplexers/demultiplexers and optical modulators/demodulators to reduce signal distortion, and an optical communication mount for aligning and powering optical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional HDMI cables use twisted wire pairs for high-speed data transmission, then the cable structure is simple and easy to manufacture, but signal distortion increases significantly at longer cable lengths
Solution Approach 1:
The patent replaces the electrical signal transmission mechanism (twisted wire pairs) with an optical signal transmission mechanism (optical fibers). Optical signals experience significantly less attenuation and distortion over long distances compared to electrical signals in copper wires, thereby resolving the contradiction between maintaining signal quality and increasing cable length.
Solution Approach 2:
The patent changes the fundamental transmission parameter from electrical signals to optical signals. This parameter change enables long-distance transmission with minimal signal degradation, as optical fibers have much lower attenuation coefficients and are immune to electromagnetic interference that plagues copper-based HDMI cables.
2Adaptability or versatility
If conventional HDMI cables are extended to longer lengths, then cable versatility is improved, but signal distortion becomes too significant for proper reception
Solution Approach 1:
The patent substitutes optical transmission for electrical transmission, enabling the cable to achieve greater length flexibility while maintaining signal reception reliability. Optical fibers can transmit signals over much longer distances without significant degradation, allowing consumers to place devices farther apart while ensuring reliable signal reception.
3Adaptability or versatility
If optical components (VCSELs and PDs) are integrated into the cable, then power transmission and indication capabilities are added, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into a single integrated cable structure: high-speed data transmission via optical fibers, low-speed data transmission via copper wire pairs, power transmission via dedicated conductors, and power availability indication via integrated LEDs. This consolidation adds versatility while managing complexity through functional integration rather than separate components.
Solution Approach 2:
The patent creates a universal cable that performs multiple functions simultaneously: optical data transmission, electrical data transmission, power delivery, and status indication. This multi-functionality is achieved by integrating different transmission media and components within a single cable assembly, allowing one cable to replace multiple separate connections.
4Reliability
If optical fibers are used for high-speed data transmission, then signal distortion is reduced for longer cables, but manufacturing precision requirements increase for aligning optical components
Solution Approach 1:
The patent incorporates preliminary alignment features directly into the connector housing structure, such as precision-machined mounting slots,定位 holes, and guide pins. These pre-built alignment mechanisms ensure that optical components (VCSELs and PDs) are correctly positioned relative to the optical fibers during assembly, reducing the need for complex post-assembly alignment procedures and lowering manufacturing precision requirements.
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 longer cable lengths with reduced signal distortion, provides power transmission, and ensures proper alignment and biasing of optical components, enhancing the reliability and versatility of data communication systems.
Implementation Method 1
The cable includes one or more optical waveguides for communicating relatively high-speed data from a first device to a second device
Implementation Method 2
An optical modulator is employed to modulate information in the form of an electrical signal onto optical energy
Implementation Method 3
An optical demodulator is employed to demodulate information on the optical energy to produce an information-bearing electrical signal
Implementation Method 4
Typically, one or more vertical-cavity surface-emitting lasers (VCSELs) are used to perform the modulation
Implementation Method 5
Typically, one or more photo detectors (PDs) are used to perform the demodulation
Data Source
AI summary
A data communication system is disclosed including a cable medium and modulator adapted to carry data and power between a high speed data source and a high speed data sink. Relatively high speed data (e.g. the TMDS data of an HDMI interface) may be carried on optical waveguides in the cable medium. Relatively low-speed data (e.g., DDC data and clock, and CEC of an HDMI interface) may be carried on a separate set of optical waveguides or wire mediums. The optical waveguides allow for substantially less signal distortion of the high-speed data, thereby allowing the cable medium to achieve much higher lengths without significantly affecting the high-speed signaling.