Optical Transmitter Pre-Emphasis for Trace Attenuation
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Solution Overview
Problem
Optical communication equipment faces signal distortion due to circuit trace attenuation, which degrades the quality of transmitted optical signals, and requires pre-emphasis to compensate for frequency-selective attenuation that varies with trace length and transmitter properties.
Innovation Solution
The system includes an optical transmitter module with a memory storing compensation values for different circuit trace lengths, and an Electric Dispersion Compensator (EDC) controlled by a processor to apply pre-emphasis, accounting for trace length and transmitter-specific properties to enhance high-frequency components of electrical signals before conversion to optical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-emphasis is applied to compensate for circuit trace attenuation, then signal quality is improved, but device complexity increases due to need for programmable compensation
Solution Approach 1:
The patent applies parameter changes by programmatically adjusting pre-emphasis compensation values based on detected circuit trace lengths. The system stores multiple compensation values corresponding to different trace lengths and selects the appropriate value, thereby adapting the signal characteristics to compensate for attenuation without requiring complex hardware modifications for each scenario
Solution Approach 2:
The patent implements preliminary action by pre-storing compensation values in memory before actual signal transmission. The system detects the circuit trace length and retrieves the corresponding pre-calculated compensation value, allowing rapid application of the correct pre-emphasis without real-time complex calculations, thus improving signal quality while maintaining manageable device complexity
2Adaptability or versatility
If compensation values are stored for multiple trace lengths, then adaptability is improved, but memory requirements and device complexity increase
Solution Approach 1:
The patent uses parameter changes by storing discrete compensation values corresponding to different circuit trace lengths. Instead of implementing continuous real-time calculation of compensation parameters, the system pre-calculates and stores these values, then selects the appropriate parameter set based on detected trace length, achieving adaptability while avoiding the complexity of real-time computation
Solution Approach 2:
The patent applies preliminary action by pre-computing and storing compensation values for various trace lengths in memory during manufacturing or initialization. This allows the system to adapt to different circuit configurations without requiring complex real-time processing, balancing adaptability with acceptable device complexity
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
This approach accurately pre-emphasizes electrical signals, improving the quality of optical signals and overall communication equipment performance by compensating for distortion based on specific trace lengths and transmitter module properties.
Implementation Method 1
the circuit trace distorts the electrical signal traveling through it. Typically, the circuit trace attenuates high-frequency components of the electrical signal
Implementation Method 2
Optical transceivers, which convert optical signals to electrical signals and vice versa
Data Source
AI summary
A method includes delivering an electrical signal over an electrical conductor to a transmitter module, which includes a memory holding compensation values corresponding respectively to different conductor lengths. One or more of the compensation values is retrieved from the memory of the transmitter module, and a waveform of the electrical signal is modified responsively to the retrieved compensation values. The electrical signal having the modified waveform is transmitted using the transmitter module over a communication link.