Fiber optics offers many advantages over conventional wire systems; they include low weight, large bandwidth capacity, simple architecture for data bussing, EMI invulnerability, and cost effectiveness. However, present-day fiber optic technology cannot meet the requirements of the most adverse space environments. The adverseness of the environment is primarily attributable to high-dose radiation and temperature extremes in a space vehicle. The technology to compensate for these problems is presently available, but developmental money would be needed, since commercial applications do not require survivability in such an environment. Initial development costs, along with the lack of sufficient reliability data, are deterring the adoption of fiber optics in space programs.