Variable Rate Transponders for Optical Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Optical networks face performance degradation due to aging components, leading to reduced signal quality and increased bit error rates, making it costly and impractical to maintain high data transfer rates without regenerators.
Innovation Solution
Implementing a system that monitors optical performance parameters like BER, adjusts transmission bandwidth downward when decline is detected, and uses a variable bit rate digital filter to maintain signal quality by reducing noise and optimizing OSNR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If optical networks operate at high bit transfer rates, then data capacity is improved, but signal quality deteriorates faster due to bandwidth limitations and component aging
Solution Approach 1:
The patent implements dynamic adjustment of the digital filter bandwidth parameter based on monitored signal quality metrics. The filter bandwidth is not fixed but adapts in real-time to maintain optimal signal quality at varying bit transfer rates, resolving the contradiction between high data capacity and signal quality degradation
Solution Approach 2:
The system changes the bandwidth parameter of the digital filter to optimize performance. By adjusting this key parameter based on operating conditions and signal quality measurements, the system maintains reliable operation across different bit transfer rates without requiring physical regenerator insertion
2Reliability
If optical networks are replaced to maintain performance, then signal quality is improved, but cost and downtime increase
Solution Approach 1:
The system performs preliminary monitoring of signal quality parameters and proactively adjusts filter bandwidth before signal quality deteriorates beyond acceptable thresholds. This preventive approach avoids the need for complete network replacement or regeneration, reducing both cost and downtime
Solution Approach 2:
The patent implements a feedback mechanism where signal quality is continuously monitored and used to adjust the digital filter parameters. This closed-loop control enables the system to self-optimize and maintain performance without external intervention or physical replacement of components
3Reliability
If optical amplifiers are placed along the link to regenerate signals, then signal quality is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and addresses the signal quality degradation issue at the receiver end through digital signal processing rather than adding physical regenerators along the transmission link. By taking the problem to where it manifests and solving it digitally, the system avoids the complexity and cost of additional optical amplifiers and regenerators in the network infrastructure
Data Source
AI summary
For an optical network link, a receiving node monitors optical performance and upon determination of lowered optical performance for an extended period of time, the node can signal a transmitting node to lower bit transfer rate from a nominal bit transfer rate. The receiving node has a transponder which has a digital electronic variable bandwidth filter to process the digitized signals at the lowered bit transfer rate to increase the SNR of the signals. Optical performance of the link is optimized although at the lowered bit transfer rate.