Coupling plane wave into a single-mode fiber （SMF） with high and steady coupling efficiency is crucial for fiber- based free-space laser systems, where random angular jitters are the main influencing factors of fibe...Coupling plane wave into a single-mode fiber （SMF） with high and steady coupling efficiency is crucial for fiber- based free-space laser systems, where random angular jitters are the main influencing factors of fiber coupling. In this paper, we verified a new adaptive-optic device named adaptive fiber coupler （AFC） which could compensate angular jitters and improve the SMF coupling efficiency in some degree. Experiments of SMF coupling under the angular jitter situation using AFC have been achieved. Stochastic parallel gradient descent （SPGD） algorithm is employed as the control strategy, of which the iteration rate is 625 Hz. In closed loop, the coupling efficiency keeps above 65% when angular errors are below 80/3tad. The compensation bandwidth is 35 Hz at sine-jitter of 15 ~rad amplitude with average coupling efficiency of above 60%. Also, experiments with simulated turbulence have been studied. The average coupling efficiency increases from 31.97% in open loop to 61.33% in closed loop, and mean square error （MSE） of coupling efficiency drops from 7.43% to 1.75%.展开更多
Remit of Journal ZTE Communications publishes original theoretical papers,research findings,and surveys on a broad range of communications topics,including communications and information system design,optical fiber an...Remit of Journal ZTE Communications publishes original theoretical papers,research findings,and surveys on a broad range of communications topics,including communications and information system design,optical fiber and electro⁃optical engineering,microwave technology,radio wave propagation,antenna engineering,electromagnetics,signal and image processing,and power engineering.The journal is designed to be an integrated forum for university academics and industry researchers from around the world.展开更多
Optical communication technology has become indispensable in modern communication systems due to its high bandwidth,low latency,and long-distance capabilities.With the exponential increase in data demand,advancements ...Optical communication technology has become indispensable in modern communication systems due to its high bandwidth,low latency,and long-distance capabilities.With the exponential increase in data demand,advancements in various types of optical fibers have played a crucial role in enhancing both transmission efficiency and network flexibility.Yet,managing heterogeneous fiber connections,particularly between different fiber structures,remains a challenge.This paper presents the design and implementation of an intelligent optical crossconnect system based on a silicon photonic neural network chip.By integrating first-order and second-order orbital angular momentum(OAM)modes generated by(de)multiplexers and dynamically managing them through neural networks,the system facilitates real-time mode conversion and cross-connect between heterogeneous multi-mode and ring-core fibers.The experimental results validate its performance,demonstrating effective mode management and low crosstalk,thus indicating potential applications in data centers and metropolitan networks.This system has broad prospects,enabling scalable interconnection between heterogeneous fiber sub-networks,thereby improving network flexibility and efficiency.展开更多
Advanced technologies such as autonomous driving,cloud computing,Internet of Things,and artificial intelligence have considerably increased data demand.Real-time interactions further drive the development of high-spee...Advanced technologies such as autonomous driving,cloud computing,Internet of Things,and artificial intelligence have considerably increased data demand.Real-time interactions further drive the development of high-speed,high-capacity networks.Advancements in communication systems depend on developing high-speed optoelectronic devices.Optical communication systems are rapidly evolving,with data rates advancing from800 Gbps to 1.6 Tbps and beyond,driven by the development of high-performance photodetectors,high-speed modulators,and advanced RF devices.Avalanche photodetectors(APDs) are used in long-distance applications owing to their high internal gain and responsivity.This paper reviews the structural designs of APDs based on various materials for high-speed communication and provides an outlook on developing APDs based on advanced materials.展开更多
基金Project supported by the National Natural Science Foundation of China （Grant No. 61205069）.
文摘Coupling plane wave into a single-mode fiber （SMF） with high and steady coupling efficiency is crucial for fiber- based free-space laser systems, where random angular jitters are the main influencing factors of fiber coupling. In this paper, we verified a new adaptive-optic device named adaptive fiber coupler （AFC） which could compensate angular jitters and improve the SMF coupling efficiency in some degree. Experiments of SMF coupling under the angular jitter situation using AFC have been achieved. Stochastic parallel gradient descent （SPGD） algorithm is employed as the control strategy, of which the iteration rate is 625 Hz. In closed loop, the coupling efficiency keeps above 65% when angular errors are below 80/3tad. The compensation bandwidth is 35 Hz at sine-jitter of 15 ~rad amplitude with average coupling efficiency of above 60%. Also, experiments with simulated turbulence have been studied. The average coupling efficiency increases from 31.97% in open loop to 61.33% in closed loop, and mean square error （MSE） of coupling efficiency drops from 7.43% to 1.75%.
文摘Remit of Journal ZTE Communications publishes original theoretical papers,research findings,and surveys on a broad range of communications topics,including communications and information system design,optical fiber and electro⁃optical engineering,microwave technology,radio wave propagation,antenna engineering,electromagnetics,signal and image processing,and power engineering.The journal is designed to be an integrated forum for university academics and industry researchers from around the world.
基金National Key Research and Development Program of China(2025YFE0102200)National Natural Science Foundation of China(62125503,62261160388)+3 种基金Natural Science Foundation of Hubei Province of China(2023AFA028)Technology Innovation Program of Hubei Province(Major Science and Technology Project)(2024BAA001)Hubei Optical Fundamental Research Center(HBO2025TQ004)High Quality Development Special Project of the Ministry of Industry and Information Technology。
文摘Optical communication technology has become indispensable in modern communication systems due to its high bandwidth,low latency,and long-distance capabilities.With the exponential increase in data demand,advancements in various types of optical fibers have played a crucial role in enhancing both transmission efficiency and network flexibility.Yet,managing heterogeneous fiber connections,particularly between different fiber structures,remains a challenge.This paper presents the design and implementation of an intelligent optical crossconnect system based on a silicon photonic neural network chip.By integrating first-order and second-order orbital angular momentum(OAM)modes generated by(de)multiplexers and dynamically managing them through neural networks,the system facilitates real-time mode conversion and cross-connect between heterogeneous multi-mode and ring-core fibers.The experimental results validate its performance,demonstrating effective mode management and low crosstalk,thus indicating potential applications in data centers and metropolitan networks.This system has broad prospects,enabling scalable interconnection between heterogeneous fiber sub-networks,thereby improving network flexibility and efficiency.
基金National Natural Science Foundation of China (62304225)Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences(E40812E4M1)
文摘Advanced technologies such as autonomous driving,cloud computing,Internet of Things,and artificial intelligence have considerably increased data demand.Real-time interactions further drive the development of high-speed,high-capacity networks.Advancements in communication systems depend on developing high-speed optoelectronic devices.Optical communication systems are rapidly evolving,with data rates advancing from800 Gbps to 1.6 Tbps and beyond,driven by the development of high-performance photodetectors,high-speed modulators,and advanced RF devices.Avalanche photodetectors(APDs) are used in long-distance applications owing to their high internal gain and responsivity.This paper reviews the structural designs of APDs based on various materials for high-speed communication and provides an outlook on developing APDs based on advanced materials.
