Network Control Apparatus for Optical Transmission Quality Margin Calculation
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Solution Overview
Problem
In optical communication networks, the measurement of error vector magnitude (EVM) for optical transmission devices without EVM measurement functionality leads to inaccurate calculation of transmission quality margin, affecting the system's performance and transmission quality.
Innovation Solution
A network control apparatus that calculates noise intensity margins by using processor-based calculations of OSNR and BER characteristics at transmission and reception ends, enabling accurate determination of noise intensity margins even without EVM measurement capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If EVM measurement is performed for optical transmission devices, then transmission quality margin can be calculated, but devices without EVM measurement functionality cannot be measured leading to inaccurate results
Solution Approach 1:
The patent introduces an intermediary approach by using BER (Bit Error Rate) as a substitute measurement parameter when EVM measurement is not available. The network control apparatus detects BER from transmission devices that lack EVM measurement functionality, and uses this BER data along with OSNR-BER characteristics to calculate transmission quality margin. This intermediary method bridges the gap between devices with and without EVM measurement capabilities.
Solution Approach 2:
The patent changes the measurement parameter from EVM to BER for devices without EVM functionality. By using OSNR-BER characteristics instead of OSNR-EVM characteristics, the system adapts to different device capabilities. The processor selects appropriate measurement parameters (EVM or BER) based on device functionality, allowing flexible and accurate transmission quality margin calculation across diverse device types.
2Reliability
If excessive margin is set in system design, then transmission quality is improved, but transmission distance deteriorates
Solution Approach 1:
The patent implements dynamic transmission quality margin calculation by continuously monitoring actual transmission conditions (BER or EVM measurements) and adjusting the margin accordingly. Instead of using a fixed excessive margin in system design, the network control apparatus calculates the minimum required margin based on real-time measurements and OSNR-BER/EVM characteristics. This dynamic approach allows the system to maintain adequate transmission quality while minimizing unnecessary margin that would limit transmission distance.
Solution Approach 2:
The patent establishes a feedback mechanism where transmission quality measurements (BER/EVM) are continuously fed back to the network control apparatus. Based on this feedback and the OSNR-BER/EVM characteristics, the system recalculates the appropriate transmission quality margin. This closed-loop feedback enables the system to optimize the balance between transmission quality and transmission distance by adjusting margin levels according to actual performance rather than relying on conservative fixed margins.
Data Source
AI summary
A network control apparatus includes a processor. The processor calculates a first OSNR corresponding to an allowable limit BER from an OSNR yield strength curve of a transmission end in a node of a transmission end. The processor acquires a reception BER of a second node of a reception end, and calculates a second OSNR corresponding to the reception BER from the OSNR yield strength curve of the transmission end. The processor calculates a first noise intensity corresponding to the allowable limit BER from the first OSNR. The processor calculates a second noise intensity corresponding to the reception BER from the second OSNR. The processor calculates a noise intensity margin, based on the first noise intensity and the second noise intensity.