Switching Controller Optical Channel Protection
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Solution Overview
Problem
Current optical channel protection schemes in fiber optics networks face challenges in achieving sub-50 millisecond traffic recovery without incurring costly implementations, as they rely on costly Optical Power Monitoring (OPM) devices and slow Optical Layer Defect Propagation (OLDP) fault propagation, which are not always reliable or efficient.
Innovation Solution
A system and apparatus utilizing a switching controller that receives digital fault status messages, Optical Layer Defect Propagation (OLDP) status messages, and optical power status messages to determine active and standby paths, leveraging fast digital fault triggers and photo-diode-based monitoring to enable quick switching decisions, thereby reducing reliance on expensive OPM devices and improving fault detection speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Optical Power Monitoring (OPM) devices are used for optical channel protection, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces expensive, complex OPM devices with inexpensive photodiodes that provide sufficient monitoring capability for protection switching. The photodiodes are simple, low-cost components that can be deployed widely without the complexity of full OPM systems, thereby reducing device complexity while maintaining adequate measurement precision for fault detection.
Solution Approach 2:
The patent extracts the essential monitoring function from complex OPM devices and implements it separately using simple photodiodes combined with digital fault triggers. This separation allows the system to achieve the necessary measurement precision for protection switching without incorporating the full complexity of traditional OPM systems.
2Speed
If fast digital fault triggers are used, then speed of fault detection is improved, but reliability may be compromised without supporting optical fault conditions
Solution Approach 1:
The patent implements a feedback mechanism where photodiodes continuously monitor optical power and provide real-time status to a controller. The controller receives both digital fault triggers and optical power status, creating a feedback loop that validates fast digital triggers against actual optical conditions, thereby maintaining reliability while achieving fast detection speeds.
Solution Approach 2:
The patent merges fast digital fault triggers with photodiode-based optical power monitoring in a unified protection scheme. By combining these two approaches, the system achieves both the speed of digital triggers and the reliability of optical fault verification, as the controller considers both digital fault status and optical power measurements before initiating protection switching.
3Loss of time
If sub-50 millisecond traffic recovery is achieved, then loss of time is reduced, but device complexity and cost increase
Solution Approach 1:
The patent achieves sub-50 millisecond traffic recovery using inexpensive photodiodes and simple digital circuitry rather than complex, expensive OPM systems. The simplicity of the photodiode-based approach enables fast response times while avoiding the complexity and cost associated with traditional OPM implementations.
Solution Approach 2:
The patent replaces the mechanical/optical complexity of OPM devices with an electrical/digital system using photodiodes and digital fault triggers. This substitution enables faster response times (sub-50 millisecond recovery) because electronic detection and processing are inherently faster than traditional optical monitoring methods, while reducing overall system complexity.
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
The solution enables sub-50 millisecond traffic recovery with reduced costs by integrating fast digital fault triggers and photo-diode monitoring, enhancing the reliability and efficiency of optical channel protection in fiber optics networks.
Implementation Method 1
The switching controller may receive, from a first Optical Supervisory Channel (OSC) module, a first Optical Layer Defect Propagation (OLDP) status message that indicates an OSC status of the super-channel on the first optical path
Data Source
AI summary
Embodiments herein include methods and apparatuses for providing optical channel protection by a switching controller in an optical networking system. The switching controller may receive, from a light module, a digital fault status message that indicates whether a digital frame demodulated from an optical signal include a fault. The switching controller may receive from an Optical Supervisory Channel (OSC) module, an Optical Layer Defect Propagation (OLDP) status message that indicates an OSC status of the optical signal on a current optical path. The switching controller may receive, from an Optical Add Drop Multiplexer (OADM) module, an optical power status message that indicates a measured power level of the optical signal on the optical path. Based on at least one of the OLDP status, the optical power status, or the digital fault status message, the switching controller may determine the optical path as a working path or a protecting path.