Fiber Optic Christmas Lights

Mine does not work and I have no money to buy a new tree!

Yes you can put strings of lights on your fiber optic tree - a tree, I bought a few years ago came with both.
If you have not already checked - but take the base of the tree outside (you will see screws to unscrew) and see if the bulb that illuminates the fiber is blown - Wal-Mart had the replacements last year.