# US 2026/0074784 A1 · Networked forward transmission-based optical network anomaly detection

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- Number: US 2026/0074784 A1
- Document ID: US20260074784A1
- Status: Published application
- Kind: A1
- Application number: 18/801,010
- Filed: 2024-08-12
- Published: 2026-03-12
- Earliest claimed: 2023-08-11
- Assignees: NEC Laboratories America, Inc.
- Applicants: NEC Laboratories America, Inc.
- Inventors: Philip JI; Yue-Kai HUANG; Ting WANG; Zilong YE
- Web page: https://patentgrep.com/patent/US20260074784A1

## CPC

- H04B 10/0791: {Fault location on the transmission path}
- H04B: TRANSMISSION

## Abstract

Disclosed are systems, and methods providing optical network anomaly detection and localization based on forward transmission sensing and route optimization and network-wide global planning of sensing routes. Multiple sensing routes are selected to cover the entire network and each link in the network is guaranteed to contain a different combination of sensing routes. These routes are then monitored concurrently and analyzed centrally. When an anomalous event occurs at a specific link, receivers in the corresponding routes will detect optical characteristic changes. Since the sensing route combination is unique for each link, a global analysis of the optical characteristic change will indicate the exact link that causes the event.

## Claims

### Claim 1

A computer implemented method for optical network anomaly detection and localization using forward transmission sensing, the method comprising:
by the computer:
determine multiple sensing routes through the optical network that the entire optical network is covered, wherein each link in the optical network has a different combination of sensing routes;
concurrently monitoring and centrally analyzing the multiple sensing routes for anomalous events;
detecting an anomalous event at a specific link in the optical network; and
determining a unique sensing route combination for the specific link in the optical network having the detected anomalous event; and
determining the specific link in the optical network having the detected anomalous event from the determined, unique sensing route combination.

### Claim 2 (depends on 1)

The method of claim 1 wherein a minimal number of multiple sensing routes is determined wherein the minimal number of multiple sensing routes so determined covers the entire optical network with per-link identification ability.

### Claim 3 (depends on 2)

The method of claim 2 wherein the minimal number of multiple sensing routes so determined is represented by log 2 (N+1), where N is the number of links in the optical network.

### Claim 4 (depends on 3)

The method of claim 3 wherein the multiple sensing routes are determined by a greedy algorithm.

### Claim 5 (depends on 4)

The method of claim 4 wherein the greedy algorithm applies a breadth-first-search to obtain all routes that originate from each node with a maximum of k hops.

### Claim 6 (depends on 5)

The method of claim 5 wherein the greedy algorithm defines a matrix T, with links as rows (N rows) and all the routes as columns (M columns) in the matrix T.

### Claim 7 (depends on 6)

The method of claim 6 wherein the greedy algorithm examines each route and selects one that introduces a minimum number of identical codes between links for deploying a new sensing route and repeats this examination, selection, introduction process until there is no identical code between different links.

### Claim 8 (depends on 7)

The method of claim 7 wherein if a link exhibits a code of all 0s, a new sensing route of only one hop is deployed to cover this particular link with all 0s.