Current Status and Progress of Digital Fiber Optic Link Monitoring (Invited)

Xian Zhou; Runzhe Fan; Xulong Yan; Zhudong Shi; Ruiqing Wang; Yuyang Gao; Yingming Peng

doi:10.3788/AOS250902

Acta Optica Sinica, Volume. 45, Issue 13, 1306022(2025)

Current Status and Progress of Digital Fiber Optic Link Monitoring (Invited)

Xian Zhou^1,2、*, Runzhe Fan¹, Xulong Yan¹, Zhudong Shi^1,2, Ruiqing Wang¹, Yuyang Gao^1,2, and Yingming Peng³

Author Affiliations

¹School of Computer & Communication Engineering, University of Science and Technology Beijing, Beijing 100083, China

²Shunde Innovation School, University of Science and Technology Beijing, Foshan 528300, Guangdong , China

³Foshan Branch, China United Network Communications Group Co., Ltd., Foshan 528000, Guangdong , China

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Figures & Tables(10)

Fig. 1. Development path of digital fiber optic link monitoring

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Fig. 2. Schematic diagram of first-order perturbation model for fiber optic transmission link

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Fig. 3. Schematic diagram of DBP structure

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Fig. 4. Two improvement schemes for CM-PPE; (a) Comparison of power curves between deconvolution CM-PPE and MMSE-PPE; (b) comparison of power curves between CM-PPE and MMSE-PPE with introduction of regularization terms

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Fig. 5. A three-stage anomaly localization scheme based on CM-PPE. (a) 1st-stage anomaly locator; (b) 2nd-stage anomaly locator; (c) 3rd-stage anomaly locator

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Fig. 6. Effect of dispersion pre distortion on CM-PPE

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Fig. 7. Effectiveness of DNN-DBP scheme with dual effects. (a) Estimation of abnormal loss power curves for different powers at 680 km of link; (b) estimation of abnormal loss power curves for different powers at 360 km and 840 km of link

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Table 1. Performance comparison of fiber optic link monitoring schemes

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Table 1. Performance comparison of fiber optic link monitoring schemes

Monitoring scheme	Deploy	Monitored object	Monitoring attribute	Localization	Structure
Digital FOLM	Non-invasive	Power^［7］ PDL^{［18-19，30］} MPI^{［21，36］} WSS^［35］ DGD^［22］ CD^［20］	Process	√	Multi span
ML-FOLM	Non-invasive	Nonlinear^［1］ OSNR^［2］ PMD^［3］ DGD^［4］ CD^［5］ PN^［6］	Cumulative	-	Multi span
Traditional FOLM	Invasive	OSNR	Cumulative/Process	-	Single span
		Power spectrum		-
		Anomaly point		√

Table 2. Performance comparison of digital fiber optic link monitoring schemes

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Table 2. Performance comparison of digital fiber optic link monitoring schemes

Scheme	Localization accuracy	Estimation accuracy	Complexity	Scenario
CM-PPE	Sub-km level	Decibel level	Low	Thousand-km level
MMSE-PPE	Sub-km level	Decibel level	Middle	Hundred-km level
DBP	km level	Decibel level	High	Thousand-km level

Table 3. Monitoring quantities of CM/MMSE-PPE and DBP
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Table 3. Monitoring quantities of CM/MMSE-PPE and DBP
Scheme CD Power PDL MPI WSS DGD
DBP √ √ √ — √ —
CM/MMSE-PPE √ √ √ √ — √

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Xian Zhou, Runzhe Fan, Xulong Yan, Zhudong Shi, Ruiqing Wang, Yuyang Gao, Yingming Peng. Current Status and Progress of Digital Fiber Optic Link Monitoring (Invited)[J]. Acta Optica Sinica, 2025, 45(13): 1306022

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