US 11,742,939 B2
Distributed fiber optic sensor placement
Philip Ji, Cranbury, NJ (US); Ting Wang, West Windsor, NJ (US); and Zilong Ye, La Verne, CA (US)
Assigned to NEC Corporation
Filed by NEC Laboratories America, Inc., Princeton, NJ (US)
Filed on Oct. 7, 2021, as Appl. No. 17/496,722.
Claims priority of provisional application 63/093,323, filed on Oct. 19, 2020.
Claims priority of provisional application 63/089,098, filed on Oct. 8, 2020.
Prior Publication US 2022/0149932 A1, May 12, 2022
Int. Cl. H04B 10/032 (2013.01)
CPC H04B 10/032 (2013.01) 9 Claims
OG exemplary drawing
 
1. A method for determining distributed fiber optic sensing (DFOS) sensor assignments tolerant of a single link failure, the method comprising:
providing a DFOS network having a plurality of nodes optically connected by a plurality of optical links, said network defined by G(V,E), where V is a set of end nodes, and E is a set of optical fiber links that and connect the end nodes in the V set, and G is subject to a single link failure;
determining possible primary DFOS sensor assignments as primary_route_set;
determining all backup DFOS sensor assignments as backup_route_set; and
from the primary_route_set and the backup_route_set, selecting a minimum set that provides shared protection against the single link failure and provides sensor services without interruption during the single link failure;
wherein the primary_route_set comprises primary_routes and the backup_route_set comprises backup_routes, the backup_routes exhibiting a tree topology and each backup_route provides backup protection to a plurality of primary_routes; and
wherein any routes considered for inclusion into the primary_route_set and the backup_route_set are considered equally, and the primary DFOS and backup DFOS sensor assignments are made as a one-step global optimization.