Laser Initiated Ordnance Systems (LIOS) provide fiber optic guided infrared radiation pulses to safely and reliably initiate many types of explosive and pyrotechnic output devices—deflagration, detonation, ignition, pressure and gas generators. LIOS systems provide microwatt level built-in-test capability (less than 1% of the no-fire power). Built-in test (BIT) is implemented by detecting a partial reflection of the power returned over a separate fiber. A positive BIT indication is certain evidence of the integrity of the firing fiber and connection to the ordnance device. The units are compact and lightweight and have a lesser power demand than electromechanical or all electronic solutions. Ordnance devices can be located remotely from the Laser Firing Unit (LFU) using strong, lightweight fiber optic cables allowing the system exceptional installation flexibility. Typical initiation times are less than 1 millisecond and the systems are highly immune to electrostatic discharge and radiation.Our LIOS systems use fiber optic-coupled high-power laser diodes that are readily source-able and as such experience very few obsolescence concerns. The systems are EMI In-sensitive due to the patented Radio Frequency Attenuating Couplers (RFACs) and Faraday cage design. The system is low voltage and does not require complex or exotic electrical components beyond the Laser Diode.