On-Chip Photonics: Principles, Technology and Applications reviews the advances of integrated photonic devices and their demonstrated applications. The discussed applications encompass a wide range of cutting-edge technologies, including quantum photonics, lasers on a chip, mid-infrared and overtone spectroscopies, all-optical processing on a chip, logic gates on a chip, and cryptography on a chip. The summaries in the book chapters facilitate an understanding of the field and enable the application of optical waveguides in a variety of optical systems. Overviews of computational tools, material platforms, and suggestions for the realization of on-chip photonic devices are also included.