The operation and features of an electronically switched, programmable binary fiber optic delay line are discussed. The design, component selection, fabrication, testing, and evaluation of a prototype are presented. The prototype comprises seven delay stages, has a maximum delay of 5µs and a resolution of 39 ns, operates over the 0.5 to 1 GHz band with a dynamic range of 36 dB, and has a power consumption of 19 W.