Integrated Photonics for Data Communications Applications reviews the key concepts, design principles, performance metrics and manufacturing processes from advanced photonic devices to integrated photonic circuits. The book presents an overview of the trends and commercial needs of data communication in data centers and high-performance computing, with contributions from end users presenting key performance indicators. In addition, the fundamental building blocks are reviewed, along with the devices (lasers, modulators, photodetectors and passive devices) that are the individual elements that make up the photonic circuits. These chapters include an overview of device structure and design principles and their impact on performance. Following sections focus on putting these devices together to design and fabricate application-specific photonic integrated circuits to meet performance requirements, along with key areas and challenges critical to the commercial manufacturing of photonic integrated circuits and the supply chains being developed to support innovation and market integration are discussed. Integrated photonics is a rapidly growing technology that has the promise to transform the many application areas of photonics, similar to how integrated circuits transformed the electronics industry of the twentieth century. The most seminal application for integrated photonics is high-capacity data communication - where discrete photonics has played a major role in long distance communication for over half a century - but the technology will be challenged to satisfy the cost, density, and power needs of short-reach communication from data center intercon- nects to intrarack connectivity. Integrated photonics-based solutions are starting to address these challenges.