What principle does a MH/HH intrusion detection system rely on to detect fiber bending?

The principle that a MH/HH intrusion detection system relies on to detect fiber bending is primarily attenuation. When fiber optic cables are bent or stressed, the light that travels through the fiber is affected, leading to an increase in signal loss or attenuation. This change in signal strength can be measured by the system, allowing it to detect unauthorized access or tampering with the fiber.

In a well-designed intrusion detection system, any bending of the fiber that exceeds specific thresholds will result in noticeable attenuation, triggering an alert. This capability is crucial for maintaining the integrity and security of the communication network, ensuring that any physical disturbances are promptly identified and addressed.

Other principles mentioned, such as signal strength, light reflection, and temperature change, may play roles in different contexts or types of detection systems but do not specifically address the fundamental mechanism for detecting fiber bending in the context of intrusion detection.