Research On GaN Communication Sensing Integrated Photoelectronic Chip

With the progress of the times and the development of information technology,the number of users of wireless communication has also increased dramatically.However,the contradiction between the shortage of wireless spectrum resources and the increase of users restricts the progress of communication technology.To solve this problem,the key is to throttle and open source the spectrum resources.Visible light communication perception as a whole is the key to solve this problem,and it is also one of the important components of 6G technology.Based on the physical phenomenon that the emission spectrum and the photodetection spectrum of Ga N quantum well diode overlap,a Ga N photoelectron chip with homogeneous integrated optical emission receiver is developed.The chip can absorb short-wavelength photons emitted by light emitters with the same quantum well structure,thereby generating photocurrent.For the core device research,this paper starts with the theory of visible light chip,then describes the device preparation in detail.Based on Ga N material,using sapphire substrate and metal-organic chemical vapor deposition process,the multi-quantum well green light-emitting diode is fabricated on one chip.Then the devices are characterized by optical and electrical characteristics,and analyzed by communication test.It is found that the core devices have good luminescence performance and strong light output efficiency.In the communication test,it is found that the chip receiver can communicate with the transmitter at zero bias and when it emits light,including the Pesudo Random Binary Sequence(PRBS)signal and audio signal.At the same time,the overlapping area of the luminescence and detection spectra is found to be about 30 nm.By integrating several identical quantum well diodes on the same chip,they can be used as communication sending and detection sensing devices respectively,which can integrate communication and sensing functions on a single chip,save spectral resources,and reduce the number and volume of transceiving and receiving devices.Then a reverse optical communication experiment is designed based on this physical phenomenon,and the device can still receive the reflected external optical signal when it is emitted.During transmission,the modulation information of the mechanical shutter is loaded on the transmission signal.After receiving,the modulation of the mechanical shutter to the transmission signal can be demodulated to demonstrate its perception of the external information.This chip can be used in audio-video communication,pulse measuring devices and photoelectric reflective sensors,with unlimited potential and prospects for development.At the same time,on the basis of the good light-emitting performance and detection characteristics of the chip,this paper also designs and implements a visible light positioning system based on the communication-aware integrated chip,which can detect the external light source in free space and display the position coordinates of the external light source on the OLED display screen in real time.