This course provides fundamental understanding of optical communication technology. Basic properties of light, fibers and waveguides will be reviewed. It emphasis on the fiber transmission characteristics such as attenuation, scattering, dispersion, absorption as well as fiber bending loss which influences optical communication system performance. This course will also cover optical transmitter and receiver system. Basic of laser operation, idea of photon, the spontaneous emission and the stimulated emission are explained. Characteristics of optical detectors will also be explained.