You might be tempted to let the oven cook the bacon, but please don't do that. It's best to par-cook the bacon, add it to the pizza and then bake. If you put the bacon on raw, all the fat will render on the pizza. However, if you fully cook the bacon, it will burn in the oven. Par-cooking the bacon will allow plenty of fat to render, and it will come out perfectly crisp after baking.