دانلود کتاب شبکه های پیشرفته دسترسی فیبر

After more than 30 years of developments from research to commercialization, fiber access networks are now mature technologies that have been widely deployed around the world. Optical access network technologies in the form of gigabit-capable passive optical networks (G-PONs) have been commoditized and are shipping in volumes of at least multiple tens of millions of units per year. Carriers around the world are busy rolling out fiberto- the-home (FTTH) networks to prepare for new upcoming internet applications such as over-the-top (OTT) video streaming, augmented reality (AR)/virtual reality (VR), collaborative online real-time video gaming, and billions of new upcoming Internet of Things (IoT). China, the most populous nation in the world, boasts an FTTH penetration rate of more than 90%, representing 380 million households connected at the end of 2019, and they are busy moving into the next-generation PON technologies. Most people think of fiber access networks as time-divisionmultiplexing (TDM)-based PONs. In fact, the word “PON” (almost always implied as some form of TDM-PON) is mostly used as a synonym of fiber access networks. However, TDM-PON is only one of the last-mile architectures most popularly adopted for the FTTH application because of its simplicity and economic benefits. For some access applications such as fronthaul in wireless networks, native TDM-PONs have their inherent challenges and may not be the suitable technology choice. Furthermore, in a real end-to-end broadband fiber access network, PON only represents the last mile connection from a carrier’s central office (CO) to the end-user customer premise. Besides the PON last-mile connection, there are many other components coming into play for a well-designed broadband fiber access network. The readers will find out from this book that simply deploying the next-generation last-mile PON system may not actually address the right problems arising from the increasing customer bandwidth demands because of other network bottlenecks and limitations. There are also deployment scenarios (e.g., thin-fiber cables from COs or cable Multi-Service Operator network upgrades) that will require new fiber access network architectures, as we will see in this book.