Luma W. Jameel, Data in ASCI Code Transmission Through Optical Fiber, Journal of Engineering and Applied Sciences, Volume 15,Issue 7, 2020, Pages 1717-1723, ISSN 1816-949x, jeasci.2020.1717.1723, (https://makhillpublications.co/view-article.php?doi=jeasci.2020.1717.1723) 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. Keywords: ASCII data;data transmission;CW laser;NRZ pulse generator;PIN photodiode;mach-zehnder modulator