If I understand both you and the parent correctly, you are describing the same process. When you melt two fibers together, the cores aren't really becoming one.

If I understand both you and the parent correctly, you are describing the same process. When you melt two fibers together, the cores aren't really becoming one. Really, they melt together such that light from one core partially evanescently couples into the core of the adjacent fiber. http://www.goochandhousego.com/products/passive-fiber-optic-components/fiber-laser-components/PEC%200178i1.pdf http://www.goochandhousego.com/products/passive-fiber-optic-...