Ikhlef, A.Chikh-bled, M.2020-10-192020-10-192012-01-01Articale in Journal of fundamental and Applied Sciences Vol. 04 N. 011112-9867http://dspace.univ-eloued.dz/handle/123456789/7148Articale in Journal of fundamental and Applied Sciences Vol. 04 N. 01The qualities required for Laser Diodes are their spatial and temporal coherence, and their performance in terms modulation. This paper presents the effect data rate of optical pulses delivered by diode laser using software COMSIS. Two types of modulation have been considered: direct modulation and external modulation.frLaser Diodes, modulation, bit rate, optical transmission.Article