Single Span Calibration in Multi-Span Optical Line Systems

The patent segments the calibration process from a system-wide full OMS calibration to a targeted single-span calibration. The system identifies and isolates the specific span requiring calibration (e.g., span 5) and performs calibration operations only on that segment, rather than recalibrating all 50 spans in the OMS. This segmentation reduces calibration time from hours to minutes while maintaining amplifier reliability through focused calibration of the affected span.

The patent applies local quality by providing differentiated calibration treatment to different spans based on their specific needs. Instead of uniform full OMS calibration, the system identifies spans with degraded performance (through monitoring parameters like OSNR, power levels, or error rates) and applies calibration only to those local segments. This allows the system to maintain high reliability where needed while avoiding unnecessary calibration in well-performing spans, significantly reducing overall calibration time and operational costs.

The patent segments the calibration scope to only the affected span rather than the entire OMS. When a single span requires calibration (e.g., due to fiber replacement, connector issues, or performance degradation), the system isolates that specific span and performs calibration operations only on the from-end and to-end nodes of that span. This segmentation ensures calibration accuracy for the problematic span while avoiding unnecessary disruption to the rest of the system, maintaining productivity during calibration operations.

The patent applies partial action by performing only the minimum necessary calibration operations to resolve the specific span issue. Rather than executing a complete full-OMS calibration sequence that would ensure accuracy across all spans, the system performs targeted calibration actions (adjusting gain, power, or other parameters) only at the boundaries of the affected span. This partial calibration approach achieves sufficient accuracy for the problematic span while minimizing system disruption and recovery time.

The patent implements self-service capabilities that allow the optical line system to automatically detect, diagnose, and correct calibration issues without requiring repeated manual intervention. The system continuously monitors span performance parameters and can autonomously initiate calibration sequences when degradation is detected, or when fiber changes are made. This self-service approach maintains high installation and operation reliability while eliminating the need for multiple expensive truck-rolls, significantly reducing operational expenditures.

The patent employs feedback mechanisms where the system continuously monitors span performance (through parameters like optical power, OSNR, BER, or other quality metrics) and uses this feedback to determine when calibration is needed. The feedback loop allows the system to identify specific spans requiring calibration and trigger targeted calibration operations automatically. This feedback-driven approach ensures reliable operation by addressing issues promptly while avoiding unnecessary calibration events, reducing both operational costs and the need for repeated field deployments.