optical fiber
Cheats recipe will guide you to the creation of optical fiber from starting items.
How to make optical fiber in Little Alchemy 2?
earth + earth = 
land- land + land =
continent - continent + continent =
planet 
fire + planet = 
sun- fire + fire =
energy - energy + sun =
solar cell - sun + solar cell =
electricity 
air + air = 
pressure- earth + pressure =
stone - air + stone =
sand - fire + sand =
glass - glass + electricity =
light bulb - electricity + light bulb =
light - fire + stone =
metal - metal + electricity =
wire - wire + light = optical fiber