So far, photonic chips have been successfully developed and widely used. Photonic chip is a new type of integrated circuit, which can integrate optical devices to realize high-speed, high-bandwidth, low-power and low-loss optical communication and optical computing. At present, there are many companies and research institutions in the development and application of photonic chips, involving data transmission, optical network, optical storage, optical computing and other fields. In the future, photonic chips will become one of the key technologies to promote technological innovation in the fields of communication, computing, and the Internet of Things.