IdealPhotonics' fiber optic loop test system is an optical testing system that uses optical fibers to create a closed-loop connection between the signal transmitter and receiver. Through precise optical path design (insertion loss <1dB) and an adjustable attenuation module (0-30dB), it enables performance testing of communication equipment (such as optical modules and switches) under simulated long-distance transmission conditions (bit error rate <10⁻¹²). It is suitable for reliability assessment of optical devices and stress testing of communication protocols.The "Trillion-cycle signal stress test," through programmable optical attenuation (0.01dB steps) and real-time bit error rate monitoring (sensitivity 10⁻¹⁵), simulates an equivalent transmission distance of 0-2000km (accuracy ±1%). It verifies the ultimate lifespan (>1×10¹² cycles) and high-temperature (85℃) reliability of optical devices (such as 400G modules), providing a military-grade quality certification platform for 5G/6G communication equipment.