This RF-Photonic Time Delay system is customized to achieve high bit resolution of true time delay in input RF signal. This system composes RF-photonic and photonic-RF conversion modules, switchable fiber optic delay modules, and optical amplification. The RF modulated laser beam is switched to pass through N fiber segments, therefore providing N-bit resolution of digitally variable time delay. The fiber optic amplifications are used in this module to compensate for optical loss through optic fiber segments and switches. The system has built-in temperature sensors and the capability to initially check the switchable delay segments through a USB interface. All high repeat rates of switching will be controlled by the external TTL signals through the D connector. Perfected with over 20 years of extensive Government funding, we offer industry-leading performance and reliability, as well as cost-effectiveness.