The latest development of integrated optical chips

2022-08-16
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The latest development of integrated optical chips in China

integrated optics came into being on the basis of emerging technology needs such as optical communication, optical computer and optical information processing. There are many problems in the production of the concept of integrated optics when they are mixed with HDPE; It was first proposed in 1969. It combines optical fiber with integrated optical path based on planar dielectric optical waveguide, which greatly promotes the rapid development of optical communication. Integrated optical path usually uses optical waveguides to connect light-emitting elements, lenses, optical transmission, optical modulation, optical coupling and optical receiving devices together, and integrate them on the substrate to form a micro optical system with certain independent functions

integrated optics is an important branch of optoelectronics, which is based on the development of micro processing technology of optoelectronics, optical waveguide theory, laser technology and microelectronics. The task of integrated optics is to miniaturize traditional optical components and systems, and "integrate" these components or systems according to the new physical point of view to form an integrated optical system with multiple functions

experimental device of ultra narrow spectrum mode-locked laser

with the continuous development of science and technology, Saint Gobain high performance plastic (SGPPL) for nano quantum wires, photonic crystals and micro resonators has become the first company to obtain TORLON reg in two different regions of the world; The progress of Pai injection molding processing qualified companies makes it possible for microcavity lasers, nano optical waveguides, nano optical detectors, etc. to become a reality, which will continue to affect the development process of integrated optics, and may achieve smaller optical integration

at present, integrated optics has become one of the most cutting-edge technologies in the field of photonics, and it is the only way and high-order stage of optical development. According to OFweek laser, with the development of technology, integrated optics is experiencing the development track of integrated electronics, that is, smaller single devices, closer integration and lower cost processing technology. Specifically, integrated optics is developing from discrete components to integrated optical chips, and will also move towards nano integrated optical chips in the future

China has also made a lot of investment in integrated optics and has made a series of progress recently. By designing different laser parameters and using the interaction of gain, nonlinearity and dispersion of the light field in the laser cavity, various pulsed laser sources have achieved fruitful results in the academic and commercial fields. However, facing the fields of ultra-high speed optical clock, high-speed optical communication technology, microwave photonics, spectral measurement and astronomical optical frequency comb, there is a higher demand for the repetition frequency of laser pulse source. Based on the dissipative four wave mixing effect, Xi'an Institute of Optics and mechanics has realized the stable laser pulse output with the fundamental frequency of 49ghz by using the on-chip micro ring resonator developed by itself. Compared with the ultrashort cavity pulse laser, it has effectively reduced the high phase noise caused by the limitation of Schawlow and towns. At the same time, using the on-chip laser mode selection mechanism, the multiple rate laser pulse of 49-735ghz is realized, which breaks through the limitation of the free spectral range of the laser cavity on the repetition frequency

201 has the characteristics of high corrosion resistance and light weight. For six years, the renxifeng research group of the Key Laboratory of quantum information of the Chinese Academy of Sciences at the University of science and technology of China, in cooperation with scientists from Zhejiang University, has successfully developed a silicon-based guided mode quantum integrated chip for the first time, which realizes the coherent conversion of single photon states and quantum entangled states between different degrees of freedom such as polarization, path, waveguide mode, etc., and its interference visibility exceeds 90%, It provides an important experimental basis for the manipulation and conversion of multiple degrees of freedom of photons on integrated quantum optical chips

compared with free space optics and fiber optics, integrated optical devices and systems have many advantages, such as small size, scalability, low power consumption, high stability and so on. In the past, in the research of integrated quantum optical chips, people usually used polarization degrees of freedom or path degrees of freedom, that is, using different polarization or different paths to realize quantum information coding. Among them, polarization coding can only realize two-dimensional quantum information process, and cannot realize high-dimensional coding, so there are obvious deficiencies in information capacity and security; Although path coding can realize high-dimensional quantum information process, in order to prevent crosstalk between different path information, its path spacing is usually large, which greatly restricts the improvement of the integration and function expansion of quantum optical chips

Ren Xifeng's research group and collaborators used the silicon nano optical waveguide eigenmode as a new dimension of quantum information coding for the first time in the development of silicon photonic integrated core elongation. A multimode waveguide supporting multiple waveguide modes was used to realize the high-dimensional coding of quantum information, which effectively avoided the problem of information crosstalk, and significantly improved the information capacity by using multiple degrees of freedom of photons. They also used the new on-chip mode converter and mode multiplexer to successfully realize the arbitrary coherent conversion between polarization, path and waveguide mode degrees of freedom. The interference visibility of single photon and two-photon is more than 90%, which fully demonstrates the possibility of manipulating multiple degrees of freedom in the integrated quantum optical chip at the same time, and lays an important foundation for the realization of high-dimensional quantum information process in the integrated quantum optical chip

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