Two or more fiber bundles at one end of a bundle branching fiber-optic patch cord, and each independent at the other end φ 2.5mm or φ 1.25mm ceramic, which can be connected to fiber probe through a sleeve to stimulate experimental animals under laser. We can choose the type of fiber, number of branches, and connector. 200um core diameter optical fibers can also be produced using low-autofluorescence technology.