Band-Sensitive Optical Channel Swapping in C+L Systems
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Solution Overview
Problem
Conventional optical networking systems face inefficiencies in channel swapping, particularly in multi-band systems like C+L band ASE-loaded systems, due to limitations in bundling strategies, leading to slow capacity changes and increased restoration times, as existing methods do not account for the sensitivity differences between frequency bands, resulting in SNR penalties and delays in Layer 0 restoration.
Innovation Solution
Implement band-sensitive bundling techniques that differentiate swapping methods based on the sensitivity of each frequency band, allowing for more aggressive swapping in less-sensitive bands like C-band and conservative swapping in more-sensitive bands like L-band, using WSS-controlled bundling to minimize SNR penalties and enable parallel capacity changes across bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bundling approaches are used in C+L band systems, then channel swapping can be performed, but SNR penalties occur and restoration speed is reduced
Solution Approach 1:
The patent applies different bundling strategies to different frequency bands based on their sensitivity characteristics. Specifically, C-band channels use one bundling approach while L-band channels use another, recognizing that each band has different SNR sensitivity to channel swapping operations. This local differentiation resolves the contradiction by optimizing for SNR in sensitive bands while maintaining faster swapping in less sensitive bands.
Solution Approach 2:
The patent segments the C+L band spectrum into separate C-band and L-band groups, applying independent bundling control to each segment. This segmentation allows the system to perform channel swapping in parallel across different bands with band-specific parameters, improving overall restoration speed while maintaining SNR performance through band-optimized strategies.
2Reliability
If channel swapping is performed one channel at a time, then SNR stability is maintained, but capacity change efficiency is reduced
Solution Approach 1:
The patent implements dynamic bundling where the bundle size and composition are adjusted based on real-time system conditions, traffic patterns, and band sensitivity. This dynamic approach allows the system to swap multiple channels simultaneously when conditions permit (improving efficiency) while maintaining SNR stability through adaptive control parameters that respond to system state changes.
Solution Approach 2:
The patent changes key parameters such as bundle size, swapping rate, and power control settings based on the specific frequency band and system conditions. By adjusting these parameters dynamically, the system achieves both SNR stability and improved capacity change efficiency, resolving the contradiction between careful single-channel swapping and fast multi-channel swapping.
3Loss of time
If aggressive bundling is used to speed up restoration, then restoration time is reduced, but SNR penalties increase
Solution Approach 1:
The patent applies less aggressive bundling to L-band channels which are more SNR-sensitive, while allowing more aggressive bundling in C-band channels. This local differentiation enables faster overall restoration while protecting SNR quality in the sensitive L-band, resolving the contradiction between restoration speed and SNR quality.
4Device complexity
If conventional single-band bundling strategies are applied to multi-band systems, then implementation is simple, but band sensitivity differences are not accounted for
Solution Approach 1:
The patent segments the multi-band system into independently controllable C-band and L-band groups, each with its own bundling parameters and control logic. This segmentation manages complexity by creating modular band-specific controllers while properly accounting for sensitivity differences through dedicated parameter sets for each band.
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 reduces SNR penalties and enhances restoration speed by allowing independent operation of channel controllers in each band, reducing the impact of changes in one band on the other, thereby improving the efficiency of capacity changes and fault recovery in optical networks.
Implementation Method 1
WSS-controlled bundling
Implementation Method 2
pre-amplifiers, post-amplifiers, and intermediate line amplifiers
Implementation Method 3
Amplified Spontaneous Emission (ASE) channel holders
Implementation Method 4
The interleaving bundling approach suffers from Stimulated Raman Scattering (SRS) penalties
Data Source
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AI summary
Systems, methods, and non-transitory computer-readable media are provided for performing channel swapping techniques for swapping bundles of optical channels in an optical network, such as a C+L band system, based on frequency band sensitivity. In one embodiment, a method includes swapping a first group of channels or first portion of spectrum in a more-sensitive frequency band with a first set of replacement channels or first portion of replacement spectrum using a first swapping technique. The method also includes swapping a second group of channels or second portion of spectrum in a less-sensitive frequency band with a second set of replacement channels or second portion of replacement spectrum using a second swapping technique that is different from the first swapping technique. The first and second swapping techniques are based at least in part on the number of channels or portion of spectrum that can be swapped at any given time instance.