Silicon-based InGaN/GaN Multiple Quantum Well Photonic Integrated Chip For Visible Light Communication

Optical communication technology using visible optical signal as a new information carrier has been greatly developed in recent years.At present,the research on photonic integrated chips is mainly in the infrared band,and the cutting-edge research on the visible light band is still lacking,and the functions of photonic integrated chips are relatively single.In order to develop a new generation of photonic integrated chip as a terminal device of the visible optical communication network,to meet the composite requirements of the visible optical signal transmission,reception,transmission and processing.Based on the silicon-based In Ga N/Ga N multi-quantum well material,a composite photon integrated chip integrating visible band micro light-emitting diode(LED)light source,waveguide structure(waveguide directional coupler and multi-port splitter)and micro photodetector is designed.luminescence detection coexistence phenomenon of a In Ga N/Ga N multi-quantum well material is used in this chip to achieve the above composite function.In this paper,the design and preparation,morphology characterization,optoelectronic performance testing and visible light communication testing of the photonic integrated chip have been completed.The prepared micro-LED light source can be used as a transmitting end to emit visible light signals in the blue band,and its luminous intensity is linearly modulated by the injected current,which can realize amplitude-modulated visible light communication,and is suitable as a transmitting end of visible light communication.The visible light signal emitted by the micro-LED light source is transmitted into the waveguide structure(waveguide directional coupler and multi-port splitter),which realizes effective transmission coupling and equal distribution of optical power on-chip.The visible light signal that is coupled and transmitted and the optical power is evenly distributed enters the miniature photodetector,and the photocurrent matching the intensity of the transmitted optical signal can be monitored.Finally,visible light communication tests also show that the chip has the ability to realize visible light communication.This research provides more possibilities for the development of composite functional photonic integrated chip terminals for the needs of visible light communication networks.