16 young scholars visited our department of Electronics Branch forum
From May 6th to 7th, the 2nd International Youth Scholars Forum of "Future Information Technology" of Shanghai Jiaotong University was held by the School of Electronic Information and Electrical Engineering. The outstanding young scholars from all over the world in the field of information technology Bring together a group to conduct in-depth exchanges and thinking collisions around the theme of “future information technology”, and talk about the hot spots, opportunities and challenges facing the development of information technology disciplines under the current situation.
Dr. Xie Yiwei from Monash University in Australia introduced a number of optoelectronic integrated chips based on different material systems for optical communication and microwave photon signal processing. Different photonic integration platforms have their own advantages and disadvantages. For different application scenarios, by selecting the most suitable integration platform, an integrated optical chip that meets specific needs can be produced. Dr. Wang Junjia from the University of Cambridge in the United Kingdom introduced a silicon-based subwavelength grating device. By controlling the duty cycle of the grating, it is convenient to adjust the effective refractive index of the waveguide, thereby realizing a variety of passive devices. Graphene is a popular two-dimensional optoelectronic material that combines with silicon waveguides to implement modulators, detectors, and nonlinear devices. These devices are highly integrated and, in some respects, conventional silicon light. The device has an advantage. The modulator is a core device in an optical communication system, which can convert a high-speed electrical signal into an optical signal, thereby realizing large-capacity data transmission using an optical waveguide. At present, high-speed silicon-based electro-optic modulators use reverse-biased PN junctions to achieve carrier modulation. However, this method also has the disadvantages of low modulation efficiency, large size, and high driving voltage. In order to further improve the performance of the modulator, Dr. Zhang Wei from the University of Southampton in the UK designed and implemented a modulator based on the lateral capacitance structure. The process preparation mainly uses the lateral growth technique of single crystal silicon. The microring resonator is a basic optical signal processing device, however, it has a temperature drift problem in practical applications. Dr. Li Yu from Singapore Microelectronics Institute designed a micro-ring resonator temperature control circuit to greatly improve the temperature sensitivity of the micro-ring. She also introduced the bonding technology of III-V materials and silicon materials, using this technology to achieve silicon-based lasers and detectors. After years of development of silicon light technology, basic devices have gradually matured. However, due to the limitations of the materials themselves, it is difficult to make major breakthroughs in the indicators of some devices. Dr. Qiu Feng from Kyushu University in Japan studied a waveguide integrated with electro-optical polymer and silicon, which can realize high-speed modulation by utilizing the electro-optic effect of the polymer. The technology is relatively mature and has industrial application prospects. Finally, Dr. Wang Zijun from the University of Rochester in the United States talked about the research progress of quantum dot lasers. Lasers are an essential core component in photonic integration. Silicon materials cannot produce light-emitting devices by themselves, and can only be epitaxially grown or bonded by means of III-V materials. Silicon-based quantum dot lasers have high temperature stability and can generate frequency comb spectra, which is a promising on-chip light source technology.
