my country's optical fiber orbital angular momentum optical communication has made a series of research progress
With the rapid development of the information age, people's demand for communication capacity has increased dramatically, and the existing optical fiber communication system can no longer meet people's needs. needs.
In order to solve the communication capacity crisis, new technologies are constantly emerging.
Among them, optical fiber Orbital Angular Momentum (OAM) optical communication provides a potential solution to this problem.
The Multi-Dimensional Photonics Laboratory (MDPL: Multi-Dimensional Photonics Laboratory) led by Professor Wang Jian of Wuhan National Laboratory of Optoelectronics has conducted extensive research on optical fiber OAM communications and has made a series of progress.
In order to achieve high speed, large capacity, high spectral efficiency and stable OAM transmission, Wang Jian's team designed a variety of new OAM optical fiber structures.
First of all, under the guidance of Professor Wang Jian, doctoral student Li Shuhui designed a multi-ring multi-OAM optical fiber structure that supports OAM multiplexing transmission. This structure provides the possibility to achieve Pbit/s level OAM multiplexing. .
Relevant research results were published in Scientific Reports in the paper "Acompacttrench-assistedmulti-orbital-angular-momentummulti-ringfiberforultrahigh-densityspace-divisionmultiplexing(19rings×22modes)".
In addition, doctoral student Li Shuhui also designed a supermode orbital angular momentum fiber structure that supports OAM transmission. This structure can increase the effective mode area of the OAM mode, reduce fiber nonlinearity, and provide long-distance high-power transmission. OAM mode provides a new option.
At the same time, Professor Wang Jian’s team has also made certain progress in optical fiber OAM multiplexing transmission experiments.
Under the guidance of Professor Wang and in cooperation with FiberHome Fujikura Technology Co., Ltd., doctoral students Wang Andong, Zhu Long and Liu Jun successfully demonstrated a hybrid wireless system that combines OAM space division multiplexing and time division multiplexing. Source Optical Network.
This technology is expected to be used in high-capacity passive optical networks in the future.
Relevant results were published on OpticsExpress in the paper "Demonstration of hybridorbitalangularmomentummultiplexingandtime-divisionmultiplexingpassiveopticalnetwork".
PhD students Wang Andong, Zhu Long and Liu Jun are the co-first authors of the paper.
OAM moduleThe converter is a key component in the OAM optical communication system. Professor Wang Jian's team proposed two new OAM mode converters based on an in-depth analysis of the characteristics of the optical fiber OAM mode.
First of all, under the guidance of Professor Wang Jian, doctoral student Fang Liang proposed a new OAM mode converter based on spiral gratings. This device can flexibly realize the generation, conversion, exchange and other functions of OAM modes, and The paper "Flexible generation/conversion/exchangeoffiber-guidedorbitalangularmomentummodesusinghelicalgratings," was published in Optics Letters.
In addition, under the guidance of Professor Wang Jian and in cooperation with FiberHome Fujikura Technology Co., Ltd., doctoral student Li Shuhui successfully demonstrated an all-fiber OAM mode converter based on few-mode fiber.
This device can achieve selective excitation from incident Gaussian mode to OAM mode or LP mode, and has the advantages of flexible operation, simple structure, and low price.
Relevant research results were published in Optics Letters in the paper "Controllableall-fiberorbitalangularmomentummodeconverter,".
After this work was published, it attracted widespread attention and was selected into the Top 10 hot downloads on the official website that month (ranked second).
