Unidirectional Media Conversion Modules for Video Signal Integrity
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Solution Overview
Problem
Conventional Small Form Factor Pluggable (SFP), SFP+, and XFP converters are not suitable for video applications due to being bidirectional, inability to process pathological patterns in professional digital video signals, and inability to directly receive single-ended unbalanced signals, leading to data errors and inefficiencies.
Innovation Solution
The development of electrical-optical media conversion systems with compact, hot-pluggable media conversion modules that include all active components for converting single-ended unbalanced electrical video signals to optical video signals and vice versa, featuring conditioning circuits like cable drivers, equalizers, and reclockers, and passive signal paths to handle these challenges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional SFP, SFP+, and XFP converters are used, then compact and hot-pluggable features are achieved, but they cannot process pathological patterns in professional digital video signals accurately
Solution Approach 1:
The patent modifies the automatic power control circuit parameters to accommodate pathological patterns. Specifically, it changes the duty cycle assumption from the conventional 50% to handle variable duty cycles up to 63.5 μs, allowing accurate processing of professional digital video signals with long duration 0's or 1's sequences
2Productivity
If conventional SFP, SFP+, and XFP converters are used, then bidirectional conversion capability is provided, but half of the converter is unused in unidirectional video systems
Solution Approach 1:
The patent extracts and removes the unnecessary bidirectional conversion circuits from conventional SFP, SFP+, and XFP converters. By taking out the unused half of the converter, the design achieves unidirectional optimization, improving productivity while reducing device complexity and cost
3Ease of operation
If conventional SFP, SFP+, and XFP converters are used, then standard optical conversion is achieved, but they cannot directly receive single-ended unbalanced signals
Solution Approach 1:
The patent merges the single-ended unbalanced signal reception capability directly into the SFP, SFP+, and XFP converter modules. By combining the electrical-optical conversion function with single-ended signal acceptance, the system eliminates the need for external conversion modules, improving ease of operation while maintaining compact design
4Reliability
If automatic power control circuits with 50% duty cycle assumption are used, then optical power output is kept at set level, but data errors occur with pathological patterns
Solution Approach 1:
The patent changes the parameter assumptions in the automatic power control circuit from a fixed 50% duty cycle to accommodate variable duty cycles. It extends the handling range to include pathological patterns with duty cycles varying over periods up to 63.5 μs, thereby improving reliability and adaptability simultaneously
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
These systems enable efficient conversion of video signals, reduce data errors, and allow for user-configurable port functions, improving reliability and flexibility in video systems by isolating failed components and minimizing signal degradation.
Implementation Method 1
an electrical-to-optical conversion module including a laser driver and a laser
Implementation Method 2
an optical-to-electrical conversion module including a photodiode
Data Source
AI summary
A media conversion system for converting electrical video signals to optical video signals and vice versa. The media conversion system includes one or more pluggable media conversion modules. Each pluggable media conversion module converts between one or more optical video signals and one or more electrical video signals. Each pluggable media conversion module typically includes an electrical video signal conditioning circuit that includes one or more of a cable driver, an equalizer and a reclocker. The media conversion system also includes a printed circuit board for receiving the one or more pluggable media conversion modules. The printed circuit board includes one or more signal paths for transporting the one or more electrical video signals between the one or more pluggable media conversion modules and one or more electrical cable connectors. Each of the one or more signal paths is completely passive.