A fiber design engineer, also known as an outside plant engineer (OSP), is a telecommunications engineer who designs optic cable systems. Your responsibilities include fiber design and its allocation, developing route maps for cable and assessing the terrain through which your cabling must pass, creating budgets for projects, determining the types of materials necessary to complete orders, and ensuring you have the right inventory for each project. Your designs and analyses are then passed off to a contractor or project manager who implements your designs.