Abstract: This study state a data of ASCII code that arranged in the transmitter section to be received by the receiver section. For this reason we designed and immmplement a new system. The system depends on CW laser source, at wavelength of 1552 nm and power of 1-7 dBm. The fiber lengths are between 5 and 80 km distance. The system working in 10 GHz data Bit Rate using two type of photodiode (PIN and APD) as a receiver in order to get more stability system transmissions. The interconnect architecture is based on the use of a software optisys Version 7.0.