Optical Transmission Amplifier GSNR Equalization
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Solution Overview
Problem
In multi-band WDM transmission systems, the existing technologies face challenges in eliminating the Generalized Signal to Noise Ratio (GSNR) difference between the C-band and the L-band, leading to suboptimal transmission characteristics due to noise figure differences and nonlinear noise.
Innovation Solution
The optical transmission device includes optical transmission amplifiers for each band, output level adjusters, a memory, and a processor. The processor controls the output level adjusters to adjust the output of the optical transmission amplifiers for each band, thereby reducing the GSNR difference between bands by optimizing the transmission path input power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If transmission path input power is increased to maximize GSNR, then signal transmission distance is improved, but nonlinear noise increases
Solution Approach 1:
The patent applies parameter changes by adjusting the transmission path input power to an optimal level that maximizes GSNR. The control unit dynamically sets the input power parameter based on measured GSNR values, balancing the trade-off between transmission distance and nonlinear noise generation. This is achieved through iterative measurement and adjustment of the power parameter.
2Object-generated harmful factors
If transmission path input power is decreased to minimize nonlinear noise, then noise level is reduced, but transmission distance is limited
Solution Approach 1:
The patent implements feedback control by measuring the actual GSNR in the transmission path and using this information to adjust the transmission path input power. The control unit continuously monitors GSNR and modifies the input power accordingly, creating a closed-loop system that adapts to changing conditions and maintains optimal transmission performance.
3Reliability
If GSNR is equalized between C-band and L-band, then transmission characteristics are improved, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent applies segmentation by separately controlling the transmission path input power for different wavelength bands (C-band and L-band). The control unit independently adjusts the input power for each band based on their respective GSNR measurements, allowing targeted optimization without requiring complex cross-band coordination mechanisms.
Data Source
AI summary
An optical transmission device includes an optical transmission amplifier for each band configured to optically amplify signal light of the band of a plurality of different wavelength bands, output level adjuster arranged at a post-stage of the optical transmission amplifier for each band, and configured to adjust an output of the optical transmission amplifier for each band and output the adjusted output to the transmission path, a memory, and a processor coupled to the memory and configured to make the output level adjuster for the each band to reduce a difference in a generalized signal to noise ratio (GSNR) between the bands.