抄録
The current computer is a complex and large system running at a high speed. Each element exchanges and processes information through the signal lines. In the case that the connections among elements are complex, it is hard to ignore both signal delay caused by the length of lines and noise or troubles caused by mutual-induction.
Therefore, faster and less trouble's transmission device is needed. But the optical transmission has no problem like that. The effective error detection method were studied; in the free space, make the elements give and receive the parallel optical data, and detect the error caused by the transmission in a moment. using the optical character.
