A photonic integrated circuit (PIC) can be seen as a 'light-based' analogue of an electronic circuit (i.e. where functionality occurs by manipulation of light rather than electrical current). Much research has gone into this area and this well-organised book sheds light on the technology behind PICs and the capabilities of the various platforms available. It provides an engineering approach to photonic integration technologies from the fundamental concepts, through to assembly issues and the integration strategies to combine different components in a single chip.