Territorial security deals with the prevention, detection, and response to unauthorized persons and/or goods from crossing a perimeter. It deals with large territories of strategic importance, such as international borders, transportation and critical infrastructure. Using of the most Intelligent and comprehensive fiber based PIDSs gives the capability to get the location of the intrusion with 10 feet accuracy. Fiber-optic based intrusion detection and alarm management solutions currently protects applications, such as commercial airports, government sites, power generation plants, and water treatment facilities.