C+L Band Optical Amplifier Gain Correction for Spectrum Failures
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Solution Overview
Problem
In C+L band photonic line systems, band-specific failures can lead to catastrophic impacts on traffic channels in the surviving band due to Stimulated Raman Scattering and tilt changes, necessitating a solution to maintain operation even when one band is missing or impacted.
Innovation Solution
A control device with a processing unit and memory stores a C+L traffic managing module that calculates a gain correction profile based on the difference between a saved baseline and measured transmission profiles, applying it to optical amplifiers to compensate for power losses and maintain spectral density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate C-band and L-band amplifying devices are used, then each band can be handled independently, but power losses and spectral density changes in one band negatively impact the surviving band
Solution Approach 1:
The patent merges the control of C-band and L-band amplifiers under a unified control device that monitors both bands and applies coordinated gain corrections. The control device calculates a gain correction profile that compensates for power losses in the surviving band by adjusting both C-band and L-band amplifiers together, transforming the system from separate independent control to coordinated unified control.
Solution Approach 2:
The patent dynamically changes the gain parameters of optical amplifiers based on real-time monitoring of spectral density and power levels. When one band fails or experiences power loss, the control device calculates correction profiles that adjust the gain parameters of both bands to compensate for the imbalance, maintaining acceptable operation in the surviving band.
2Quantity of substance
If one band is missing or impacted, then traffic in that band is lost, but the surviving band experiences negative influences including SNR penalties and power losses
Solution Approach 1:
The control device implements continuous feedback monitoring of spectral density and power levels in both C-band and L-band. When power losses or spectral imbalances are detected in either band, the system calculates gain correction profiles and applies them to compensate for the harmful effects, maintaining stable operation in the surviving band despite the absence or impairment of one band.
3Reliability
If gain correction is applied to compensate for power losses, then surviving band performance is maintained, but system complexity increases due to coordination requirements
Solution Approach 1:
The control device is designed as a universal multi-functional unit that can monitor both C-band and L-band spectral density, calculate gain corrections for either or both bands, and coordinate amplifier adjustments across the entire C+L band system. This universal controller consolidates what would otherwise require separate control mechanisms for each band, managing complexity through functional integration.
Data Source
AI summary
Systems and methods are provided for controlling one or more optical amplifiers of a C+L band photonic line system (30) of a telecommunications network in which C-band signals and L-band signals may be transmitted. In one implementation, a method (130) may execute a traffic managing module (23). When executed, the traffic managing module (23) may be configured to enable a processing device (12) to calculate (132) a gain correction profile based on a difference between a saved baseline transmission profile (84) and a measured transmission profile (94) of a surviving band of a photonic line system (30) when another band of the photonic line system (30) is missing or impacted. The traffic managing module (23) may further be configured to enable the processing device (12) to apply (134) the gain correction profile to a respective optical amplifier (46) of the photonic line system (30) to compensate for the difference.