Chromatic Dispersion Estimation in Optical Networks
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Solution Overview
Problem
In optical transmission networks, especially in ultralong-distance networks with high baud rates, chromatic dispersion (CD) causes signal distortion and transmission errors, necessitating accurate CD compensation, but existing methods are inadequate in addressing polarization mode dispersion and other impairments.
Innovation Solution
A CD estimation method and device that converts data of orthogonal polarization states from time-domain to frequency-domain using discrete Fourier transform, performs extraction and linear combination operations to estimate the CD value, effectively mitigating the influence of polarization mode dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional CD estimation methods are used in ultralong-distance optical transmission networks, then transmission length and baud rate can be increased, but chromatic dispersion causes signal distortion and transmission errors
Solution Approach 1:
The patent replaces conventional time-domain CD estimation methods with a frequency-domain estimation approach using Fast Fourier Transform. This substitution enables accurate CD measurement by analyzing frequency components, effectively resolving signal distortion issues in ultralong-distance transmission without compromising transmission capacity
Solution Approach 2:
The patent changes the estimation parameter from time-domain signals to frequency-domain parameters. By transforming the estimation basis to frequency domain and using specific frequency point relationships, the method achieves accurate CD estimation that compensates for dispersion effects, maintaining signal quality at high baud rates and long transmission distances
2Measurement precision
If accurate CD compensation is implemented, then signal distortion can be reduced, but the complexity of the estimation process increases due to polarization mode dispersion effects
Solution Approach 1:
The patent extracts and utilizes only the necessary frequency domain components (specific frequency points and their relationships) for CD estimation. By selecting critical frequency points and their phase relationships, the method achieves accurate estimation without processing the entire signal spectrum, thereby reducing computational complexity while maintaining precision
Solution Approach 2:
The patent performs frequency domain transformation and identifies frequency point relationships in advance before CD calculation. By pre-establishing the relationship between frequency points and CD parameters, the estimation process becomes more efficient and less complex, achieving high precision without excessive computational burden
Data Source
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AI summary
The disclosure discloses a Chromatic Dispersion (CD) detection method for an optical transmission network. Data of two polarization states orthogonal to each other is converted from time-domain data to frequency-domain data, extraction is performed on the frequency-domain data and a linear combination operation is performed on the extracted frequency-domain data, an argument of a CD value of the data of the two polarization states are obtained according to a result of the linear combination operation, and the CD value is estimated according to the argument of the CD value of the data of the two polarization states. The disclosure further discloses a CD detection device for the optical transmission network and a storage medium.