Study On Terahertz Wireless Communication Source Based On Semiconductor Optoelectronic Devices

Radio over Fiber(RoF)communication technology is a new network transmission technology which integrates optical communication and wireless communication.With the development of science and technology and the development of human society,the demand for communication is higher and higher.And the emergence of RoF technology for the next form of information transmission put forward a new kind of possibility: different from the past a single optical fiber communication and wireless communication,RoF technology has realized the optical fiber communication network with the wireless communication network seamless connection.RoF technology not only realizes the integration of data network,but also provides a possibility for high speed data wireless transmission.The research of RoF technology is now divided into three main directions: Radio-frequency(RF)signal generation based on RoF,optical fiber transmission of RF signal,and processing of these three main directions in RF signal light domain.Among them,RF signal generation based on RoF is the direction I am studying now,and the main research object in this direction is to generate RF signal by optical signal.Since the current wireless network is moving in a direction of convergence and high speed,the RF signal generation based on RoF technology can be well satisfied with this requirement.In recent years,with the development of semiconductor optoelectronic technology,various optoelectronic devices have been designed and applied in practice.Integrated optical devices have the advantages of small size,high efficiency and good performance,so they have been widely studied over the years.The wireless communication source based on semiconductor optoelectronic devices can realize high performance RF signal transmission,and naturally has the advantage of fusion network.In my research,the wireless communication source based on semiconductor optoelectronic devices is to use semiconductor optoelectronic devices to design optical to generate RF signals.I used the radiofrequency signal based on optical heterodyne method as the basis to study the wide tunable RF signal,and the frequency of RF signal can reach the terahertz level.For my research,I studied and designed two different schemes,both based on the optical heterodyne method.My main work and research contents are as follows:1.A broadly tunable RF signal optical generation scheme based on reflection type semiconductor optical amplifier.The solution is to use a Mach-increases the del Modulator(MZM)and a Reflective Semiconductor Optical Amplifier(RSOA).The signal modulated by MZM is injected into the RSOA,resulting in a relatively flat light frequency comb due to the four-wave mixing effect of RSOA and its wide gain bandwidth.We through the two optical with different center frequency Tunable Bandpass Filter(OTBF)choose two different frequency components,finally the two beams of light injection agent or light mixer to generate the RF signal.The generated RF signals can cover microwave,millimeter-wave,terahertz range.2.Broadly tunable RF signal generation based on two Distributed Feedback Laser(DFB laser)and Semiconductor Ring Laser(SRL)double injection locking.This project is through two DFB lasers and SRL double injection locking,produced by SRL bidirectional output characteristic of DFB laser feedback,through the effects of four wave mixing enhancement phase correlation,by adjusting the DFB laser of SRL longitudinal mode to realize adjustable effect.In this program,my work is mainly to establish and improve the model,and to study the possibility and prediction effect of RF signal production through simulation.