Optical Network Path Establishment via Direct Power Control
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Solution Overview
Problem
Existing optical network communication path establishment methods are slow, particularly in scenarios requiring fast restoration due to the sequential power leveling process across multiple ROADMs, leading to significant delays in setting up alternative paths during network faults.
Innovation Solution
Implementing a first power-up mode where the power level of each section in the communication path is set directly to a target power level, estimated based on pre-defined factors, eliminating the need for incremental power adjustments and allowing all sections to reach the target power level in a single step, thereby reducing overall setup time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If incremental power adjustments are used to establish a communication path, then the power level can be controlled safely without damaging receivers, but the time required to establish the communication path increases significantly
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing optimal power control factors for different communication scenarios. When a new path is established, these pre-computed factors are directly applied, eliminating the need for time-consuming incremental power adjustments. This allows the system to achieve fast path establishment while maintaining receiver protection through accurate power level prediction.
Solution Approach 2:
The patent implements the skipping principle by bypassing the traditional incremental power adjustment process entirely. Instead of gradually increasing power in small steps, the system directly sets the power control factor to the pre-calculated optimal value, rushing through the power establishment phase while still ensuring safe operating levels through accurate preliminary calculations.
2Stability of the object's composition
If traditional power leveling algorithms are used across multiple ROADMs, then existing channel traffic is protected from oscillations, but the complete channel provisioning time increases to tens of seconds or minutes
Solution Approach 1:
The patent applies preliminary action by pre-calculating power control factors for all ROADMs in the communication path before actual path establishment. These pre-computed factors account for the specific characteristics of each ROADM and its current channels, enabling all ROADMs to simultaneously achieve stable power levels without sequential incremental adjustments, thus maintaining stability while dramatically improving provisioning speed.
Solution Approach 2:
The patent segments the power control problem into independent per-ROADM calculations. Each ROADM's power control factor is calculated independently based on its specific characteristics and current state, allowing parallel processing and simultaneous application across all ROADMs. This segmentation eliminates the sequential dependency in traditional algorithms, improving provisioning speed while maintaining individual ROADM stability.
3Measurement precision
If sequential power-up procedures are used in chains of ROADMs, then each section can be individually monitored and controlled, but the overall path establishment time becomes dependent on the number of ROADMs involved
Solution Approach 1:
The patent applies preliminary action by pre-calculating power control factors for all ROADMs in the chain simultaneously, taking into account their individual characteristics and interconnections. This eliminates the sequential processing requirement while maintaining the ability to individually monitor and control each section, as the pre-computed factors are specific to each ROADM's configuration and can be independently verified after simultaneous application.
Data Source
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AI summary
A method is provided for establishing a communication path in an optical network, the communication path comprising a plurality of sections, wherein the power level of a section is controlled by a respective power control unit of a network node. The method comprises the steps of, in response to a request to establish a communication path, step 201, controlling at least one power control unit to perform a first power-up mode of operation. The first power-up mode of operation comprises the step of setting a power control factor of a respective section of the communication path directly to a value estimated to provide a target power level, step 203.