OptiFender, by Optics11, is a fiber optic partial discharge monitoring system designed to monitor critical components in high-voltage assets in remote and high EMI locations. The system uses unique fiber optic technology, making the sensors passive, immune to EM fields, easy to install, and suitable for remote locations. OptiFender can monitor terminations, joints, bushings, switch gears, transformers, and electrical machines. It detects partial discharge by measuring ultrasonic acoustic waves generated by microscopic electrical discharges within insulation systems. The modular design allows easy configuration and expansion from 3 to 32 channels.