We report a time-to-space conversion technique using a material which has a large χ(3)(≃10-6 esu) and a fast response time (≪7 ps) at room temperature. The material is a self-organized quantum-well system consisting of inorganic well layers and organic barrier layers. We achieve a high conversion sensitivity even for nJ-order optical pulses. We demonstrate serial-to-parallel conversion of nJ-order Tbits/s signals at room temperature with conversion rates of 140 GHz. © 2000 American Institute of Physics.