Wavelength Division Multiplexer with Dynamic Packet Switching
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Solution Overview
Problem
Conventional wavelength division multiplexing systems have a fixed mapping of data sources to optical encoders, which may not optimize the capacity of fiber optic communication links and can be affected by varying channel characteristics such as bit error rates, signal to noise ratios, and other factors.
Innovation Solution
A wavelength division multiplexing communication system that selectively directs data from multiple sources to different digital signal processors (DSPs) based on quality metrics, using a packet switch to route data packets on optical channels with optimal characteristics, such as lowest latency or error rate, and adjusts transmission parameters like modulation type and error correction codes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed mapping of data sources to optical encoders is used, then the system structure is simple, but the fiber optic communication link capacity is not optimized
Solution Approach 1:
The patent implements dynamic channel assignment where the mapping between data sources and optical encoders is no longer fixed but can change based on real-time channel conditions. The system continuously monitors quality metrics (bit error rate, signal-to-noise ratio, fading, dispersion) and dynamically reassignes data sources to the best available optical channels, transforming the static system into an adaptive one that optimizes capacity while managing complexity through automated control.
Solution Approach 2:
The system changes the operational parameters of the WDM system by allowing dynamic modification of channel assignments based on measured quality metrics. Instead of fixed wavelength-to-source mapping, the system adjusts which data source uses which optical channel based on real-time conditions, changing the system's configuration parameters to maximize capacity utilization.
2Adaptability or versatility
If conventional fixed optical transponders are used, then the device complexity is low, but the system cannot adapt to varying channel characteristics such as bit error rates and signal to noise ratios
Solution Approach 1:
The patent introduces feedback mechanisms where the system continuously monitors channel quality metrics (bit error rate, signal-to-noise ratio, fading, dispersion) and uses this feedback information to make informed decisions about channel assignments. The feedback loop enables the transponder to adapt to varying channel characteristics by adjusting data source mappings based on real-time performance data, transforming fixed transponders into adaptive ones.
Solution Approach 2:
The system performs preliminary measurements of channel characteristics (bit error rate, signal-to-noise ratio, fading, dispersion) before making channel assignment decisions. By预先 characterizing the optical channels and maintaining quality metric information, the system can proactively assign data sources to optimal channels before performance degradation occurs, rather than reacting to failures.
Data Source
AI summary
A data communication system for transmitting packets over one or more optical fibers includes a transponder with a number of digital signal processors that transmit data packets on different optical channels. The transponder includes a switch that receives a data packet on an input and selects one of the digital signal processors to transmit the packet based on quality metrics for the different optical channels and/or information included in an OSI header for the data packet.