Optical Transmitter Adaptive Modulation for Subcarrier Failure Recovery
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Solution Overview
Problem
In super-channel optical signal transmission, failures in subcarriers lead to reduced transmission capacity, and providing redundant components to mitigate this increases costs, while excluding failed lanes results in decreased capacity.
Innovation Solution
An optical transmitter that splits client signals and applies different modulation methods to subcarriers based on a control signal, switching to higher frequency efficiency methods when failures occur, maintaining transmission capacity without redundant configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant components are provided in advance to handle subcarrier failures, then transmission reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements dynamic reconfiguration of the optical transmission system when failures occur. Instead of static redundant components, the system dynamically adjusts the modulation method from first modulation method to second modulation method with higher frequency efficiency, and reallocates client signals to remaining functional subcarriers. This dynamic adaptation maintains reliability without requiring permanent redundant hardware.
Solution Approach 2:
The patent changes operational parameters (modulation method, signal allocation) in response to failures rather than changing physical components. By switching modulation methods and reassigning signals, the system maintains transmission reliability through parameter adjustment rather than hardware redundancy, reducing device complexity.
2Reliability
If fallback is performed excluding failed lanes, then transmission reliability is improved, but productivity decreases
Solution Approach 1:
The patent applies parameter changes by switching to modulation methods with higher frequency efficiency when failures occur. This allows the system to maintain or even improve transmission capacity on remaining subcarriers compared to simple exclusion, thereby maintaining productivity while ensuring reliability.
Solution Approach 2:
The system dynamically reallocates client signals to remaining functional subcarriers and adjusts modulation parameters in real-time. This dynamic response prevents permanent capacity loss by optimizing resource utilization, maintaining productivity while handling failures.
3Productivity
If modulation method with higher frequency efficiency is applied, then productivity is improved, but reliability worsens due to increased complexity of adaptation
Solution Approach 1:
The patent prepares multiple modulation methods in advance, with the second modulation method having higher frequency efficiency already configured and ready. When failures occur, the system switches to the pre-prepared higher efficiency modulation method, gaining productivity without the complexity of real-time optimization. The preliminary preparation of alternative modulation schemes ensures stability.
Solution Approach 2:
The control means monitors the operational state of subcarriers and provides feedback to determine when to switch modulation methods. This feedback mechanism ensures reliable decision-making for switching to higher efficiency modulation, maintaining system stability while improving productivity when appropriate.
Data Source
AI summary
To enable the transmission and reception of a super-channel optical signal to continue maintaining the possible transmission capacity without providing a redundant configuration in advance even though a failure occurs in a subcarrier, an optical transmitter 10 of the present invention includes a splitting means 20 for splitting an inputted client signal so as to make frequency efficiency in optical modulation means optimized; optical modulation means 31 to 3N for modulating one of subcarriers having mutually different wavelengths with the client signal output; a multiplexing means 40 for multiplexing the modulated signals and outputting a super-channel optical signal; and a control means 50, in a state where a failure occurs in one of the subcarriers, for making a split client signal output to modulation means corresponding to a subcarrier having no failure and applying a modulation method with a higher frequency efficiency to at least one of the modulation means.