Optical Spectrum Controller for PSD Offset Compensation
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Solution Overview
Problem
Conventional optical networking systems face instability and scalability issues due to peer-to-peer messaging in managing optical spectrum control, especially in mesh networks with multiple dependent control domains, leading to oscillations and prolonged instability during capacity changes and faults.
Innovation Solution
Implementing a distributed controlled optical spectrum framework with autonomous sectional controllers that estimate and compensate for power spectral density (PSD) offsets independently, eliminating the need for peer-to-peer messaging by dividing PSD offsets into self-introduced and uncompensated components and adjusting amplifier gains accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If peer-to-peer messaging is used for optical spectrum control between control domains, then control stability can be maintained in simple networks, but system complexity and messaging overhead increase significantly in mesh networks with multiple dependent control domains
Solution Approach 1:
The patent segments the optical network into independent control domains, each with its own controller that operates autonomously. Instead of requiring peer-to-peer messaging between all controllers, each controller independently manages its domain by receiving control parameters from a central controller and adjusting local optical elements. This segmentation eliminates the need for complex inter-controller messaging while maintaining stability through centralized coordination.
2Stability of the object's composition
If peer-to-peer messaging is implemented between neighboring control domains, then sequential control operations can be achieved, but the system fails to scale in linear networks with long chains of cascaded control domains
Solution Approach 1:
The patent introduces a central controller as an intermediary that coordinates all control domains. Instead of direct peer-to-peer messaging between neighboring domains, the central controller receives status information from all domains and sends control parameters back to them. This intermediary approach enables the system to scale to any number of control domains without requiring complex sequential messaging protocols, as the central controller manages all interactions centrally.
3Productivity
If multiple downstream controllers compensate for upstream faults simultaneously, then fault recovery speed is improved, but oscillations and prolonged instability occur in the optical spectrum
Solution Approach 1:
The patent implements a feedback mechanism where the central controller receives real-time status information from all control domains and adjusts control parameters accordingly. When an upstream fault occurs, the central controller coordinates the compensation actions of downstream controllers based on feedback about the fault status and spectrum conditions. This centralized feedback control prevents simultaneous uncoordinated compensation actions that cause oscillations, while still enabling fast fault recovery through coordinated response.
Data Source
AI summary
Spectrum control systems and methods are implemented to minimize power spectral density (PSD) offsets by adjusting gain of optical amplifiers in an optical section. The optical section is a logical boundary from one optical signal access point to a next adjacent optical signal access point. The systems and methods include estimating PSD offset from a given target for a peak channel at each span in the optical section, wherein the estimated PSD offset is divided at each span into two components including a self-introduced offset and an uncompensated offset from upstream; generating, for each span, a separate controller response for the self-introduced offset and the uncompensated offset from upstream; and controlling the gain of the optical amplifiers based on the separate controller response for the self-introduced offset and the uncompensated offset from upstream, for each span.