Optical Fiber Anomaly Detection Using Channel Power Tilt Through Forward and Inverse Calculation of ISRS

The proposed low-complexity fiber anomaly detection method, utilizes power tilt comparison from forward and backward ISRS calculation, demonstrating maximum positioning error of $0.7 \%$ and strength estimation error of $4.2 \%$ in an $80 \mathrm{~km} \mathrm{C}+\mathrm{L}$-band experiment link.