Optical Transmission Device Dynamic Rate Adaptation
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Solution Overview
Problem
In optical transmission systems, long-distance transmission leads to signal attenuation and quality deterioration due to chromatic dispersion, polarization mode dispersion, and high costs associated with optical regenerators, especially in WDM networks where each wavelength requires photo/electric conversion elements.
Innovation Solution
An optical transmission device that dynamically adjusts the transmission rate of optical signals based on the number of active clients and signal quality, using an Optical Supervisory Channel (OSC) to monitor and control the transmission rate, thereby reducing the need for additional optical regenerators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the transmission distance is extended by adding optical nodes with amplifiers, then the transmission span is increased, but the signal quality deteriorates due to accumulated chromatic dispersion and polarization mode dispersion
Solution Approach 1:
The patent implements dynamic adjustment of transmission rate based on real-time monitoring of signal quality parameters (chromatic dispersion, polarization mode dispersion, OSNR). The system transitions from static to dynamic operation by continuously adapting the transmission rate to current channel conditions, allowing extended transmission spans while maintaining signal quality through automated rate adaptation.
Solution Approach 2:
The system changes the transmission rate parameter in response to deteriorating signal quality. By monitoring chromatic dispersion, polarization mode dispersion, and OSNR, the system adjusts the transmission rate to compensate for accumulated impairments over extended spans, resolving the contradiction between extended reach and signal quality.
2Reliability
If optical regenerators are added to maintain signal quality over long distances, then signal quality is improved, but the system cost increases significantly due to photo/electric conversion elements required for each wavelength in WDM networks
Solution Approach 1:
The patent extracts the expensive photo/electric conversion function from the transmission path by implementing all-regeneratively-transparent (ART) operation. The system achieves signal quality improvement without optical regenerators by using dynamic rate adjustment and forward error correction, eliminating the need for costly photo/electric conversion elements at each wavelength.
Solution Approach 2:
The system replaces expensive optical regenerators with cheaper electronic rate adjustment mechanisms and software-based forward error correction. The contradiction is resolved by using low-cost computational methods instead of high-cost hardware regeneration elements.
3Productivity
If the transmission rate is increased to accommodate more active clients, then the network capacity is improved, but the signal quality deteriorates over long transmission distances
Solution Approach 1:
The system dynamically adjusts the transmission rate based on the number of active clients and real-time signal quality monitoring. When more clients are activated, the system increases the transmission rate to accommodate the demand, but simultaneously monitors chromatic dispersion, polarization mode dispersion, and OSNR to ensure signal quality remains acceptable, resolving the contradiction between capacity and quality.
Solution Approach 2:
The patent implements a feedback mechanism where the transmission rate is continuously adjusted based on monitored signal quality parameters. The system measures chromatic dispersion, polarization mode dispersion, and OSNR, then uses this feedback to optimize the transmission rate, allowing high capacity operation while maintaining signal quality through closed-loop control.
Data Source
AI summary
An optical transmission device includes: an optical signal generator to generate and transmit an optical signal that transmits data; a detector to detect a number of active clients; and a processor to determine transmission rate of the optical signal according to the number of active clients and quality of the optical signal at an optical receiver.