Optical chips are the direct chips that complete the conversion of photoelectric signals in optical modules, which are also divided into laser chips and detector chips. Among them, laser chips are the most critical and responsible for completing the electro-optical conversion, mainly affecting the transmission distance and communication rate of the optical module. The newly developed photonic crystal laser for micro source photons is a new generation of semiconductor laser chips, which utilizes the topology structure of 3D photonic crystals to construct a high Q semiconductor resonant cavity, The comprehensive upgrade of laser chip power, linewidth, modulation rate, beam quality, emission angle and other characteristics will become a new generation of technology solution for comprehensive cost-effectiveness upgrade in the field of high-speed coherent optical communication applications.