Optical Link Noise Compensation via Launch Power Offsets
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical communication systems face inefficiencies in monitoring and performance enhancement due to noise impairments like self-phase modulation and cross-phase modulation, which are not adequately addressed by conventional channel equalization methods.
Innovation Solution
A method and system that determine noise levels and launch power offsets for optical channels by calculating self-phase modulation and cross-phase modulation noise values, adjusting the attenuation function of Wavelength Selective Switches to optimize optical power, thereby improving the Optical Signal-to-Noise Ratio and overall link performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel equalization is applied to equalize OSNR of every channel, then the performance of the optical link is improved, but the solution does not take into account differences between the worst performance channel and other channels, limiting further optimization
Solution Approach 1:
The patent applies local quality by determining individual launch power offsets for specific channels based on their noise levels and SPM/XPM effects, rather than applying a uniform equalization approach. This allows each channel to receive customized power adjustment tailored to its specific impairment characteristics, thereby improving both reliability and adaptability simultaneously
2Reliability
If dispersion uncompensated links are used, then cost is reduced and OSNR is improved, but fiber nonlinearity impairments such as self-phase modulation and cross-phase modulation occur
Solution Approach 1:
The patent converts the harmful effect of fiber nonlinearity into a beneficial measurement opportunity by using the observed SPM and XPM effects to determine launch power offsets. Instead of trying to eliminate nonlinearity, the system measures its impact on each channel and uses this information to optimize launch powers, thereby transforming the impairment into a useful diagnostic signal for performance optimization
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the performance of optical transport networks by specifically addressing noise impairments, leading to improved communication capabilities and increased transmission capacity by optimizing channel performance based on calculated noise ratios and power adjustments.
Implementation Method 1
determining the present generalized Optical Signal-to-Noise Ratio is based on self-phase modulation (SPM) and cross-phase modulation (XPM) effects
Implementation Method 2
determining the present generalized Optical Signal-to-Noise Ratio is based on self-phase modulation (SPM) and cross-phase modulation (XPM) effects
Data Source
AI summary
System and method for improving performance in an optical link. The optical link includes a plurality of communication channels for transmitting an optical signal. The method is performed by a link controller of the optical link. The method comprises determining a noise level of at least one channel of the plurality of channels, determining a launch power offset for the at least one channel and performing link commissioning based at least in part on the launch power offset.