Optical Amplifier Gain Tilt Control for Transient Mitigation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In optical networks using wavelength division multiplexing, transient effects such as channel drops lead to power variations and degradation of the optical signal-to-noise ratio (OSNR) across channels, particularly in multiband systems, where the optimal gain and pre-tilt of amplifiers need to be adjusted dynamically to maintain equal power levels.
Innovation Solution
The method involves acquiring actual performance parameters in each span of the optical network, computing and adjusting the settings of control elements within the amplifiers, including variable optical attenuators, to rapidly adapt the gain and tilt of amplifiers, thereby reducing the impact of transient effects and maintaining equal OSNR across channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If individual amplifiers per band are used in multiband systems, then spectral usage efficiency is improved, but OSNR equality across channels deteriorates during transient effects
Solution Approach 1:
The patent implements dynamic adjustment of amplifier gain and tilt settings in response to transient effects. The system continuously monitors channel power levels and automatically recalibrates amplifier parameters to maintain equal OSNR across all channels during transients, transforming static amplifier operation into adaptive dynamic control.
Solution Approach 2:
The system employs feedback mechanisms where the actual performance parameters of each span are acquired and used to compute new amplifier settings. This closed-loop control ensures that OSNR equality is maintained by continuously adjusting amplifier gain and tilt based on real-time system state, resolving the contradiction between spectral efficiency and OSNR stability.
2Reliability
If amplifier gain and tilt are adjusted dynamically, then OSNR equality is improved during transients, but system complexity increases
Solution Approach 1:
The patent divides the optical network into multiple spans, each with its own associated amplifiers and control elements. This segmentation allows independent optimization and control of each span's amplifier settings, simplifying the overall control architecture while maintaining OSNR equality across the entire system during transient effects.
Solution Approach 2:
The system maintains reliability by changing physical parameters (gain and tilt) of existing amplifier components rather than adding complex new hardware. This approach achieves OSNR equality during transients through parameter adjustment of control elements already present in the amplifiers, minimizing additional system complexity.
3Speed
If control elements are adjusted rapidly, then transient impact reduction speed is improved, but control precision may deteriorate
Solution Approach 1:
The system performs preliminary computation of optimal amplifier settings based on acquired performance parameters before actual adjustment. This pre-calculation ensures that rapid adjustments are made to precisely computed target values, maintaining both speed and precision in the control process during transient effects.
Solution Approach 2:
The patent replaces manual or mechanical adjustment mechanisms with electronic control systems that can rapidly and precisely adjust amplifier parameters. This substitution enables fast digital computation and implementation of control settings, achieving both rapid response and high precision in transient mitigation.
Data Source
AI summary
Provided is a method for reducing the impact of transient effects in an optical network. The optical network includes at least one span, and an optical signal having a plurality of sub-bands travels through at least one span of the at least one span of the optical network. Each of the at least one span has associated amplifiers and the associated amplifiers are connected to launch optical signals into a remainder of a corresponding optical transmission line. Respectively one of the sub-bands of the optical signal traveling through the span is amplified by one of these associated amplifiers. Each of the associated amplifiers includes at least one control element for controlling gain and tilt of the corresponding amplifier. The method includes the steps of for each span, acquiring an actual value of at least one performance parameter; for each span, respectively computing actual settings for each of the control elements included in the amplifiers associated to the corresponding span based on the actual value of the at least one performance parameter of the corresponding span; and for each span, respectively adjusting the settings of each of the control elements included in the amplifiers associated to the corresponding span based on the computed actual settings for the corresponding control element, in order to reduce the impact of transient effects.