The textbook "Advanced Optoelectronic Devices" offers a comprehensive analysis of advancements in the field of optoelectronics and their significance for the applied sciences of the coming century. It highlights the key role that optoelectronic technologies will play in the development of future communication systems, particularly concerning high data transmission rates and large bandwidths. The book discusses the latest developments in semiconductor technology, including heterostructures and mesoscale structures, which are used in light generation, modulation, detection, and processing. Additionally, it addresses the enhancement of optoelectronic device performance through innovative glass processes and the use of rare earth elements in optical fibers. These advancements not only enable the amplification of light signals but also the generation of coherent light sources in fiber lasers. The book is aimed at professionals and students who wish to engage with the latest trends and technologies in optoelectronics.