Mode of transmission
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Modes of Transmission: An Overview
Mode-Multiplexed Transmission in Multimode Fibers
Keywords: mode-multiplexed transmission, multimode fibers, photonic lanterns
Mode-multiplexed transmission is a technique that leverages multiple spatial modes within a single fiber to increase data capacity. Recent experiments have demonstrated the feasibility of combining mode-multiplexed and wavelength-multiplexed transmission over conventional graded-index multimode fibers. By using mode-selective photonic lanterns, researchers can precisely excite specific modes and compensate for differential group delays. This method has successfully transmitted 30-Gbaud QPSK signals over 60 WDM channels, 3 spatial modes, and 2 polarizations, reaching distances up to 310 km 1.
Dual-Circular-Polarized OAM Transmission
Keywords: dual-circular polarization, orbital angular momentum, mode selection
A novel approach to orbital angular momentum (OAM) transmission involves dual-circular polarization (CP) to enhance data rates. This method uses identical circular arrays of microstrip antennas at both the transmitter and receiver, with a discrete Fourier transform (DFT) feed network to achieve quasi-eigenmode transmission. By selecting high-gain modes and distributing power equally among them, this technique can increase the achievable data rate by 2 bits/s/Hz compared to traditional short-range MIMO systems 2.
Mode-Selective Transmission Lines
Keywords: mode-selective transmission line, low-loss, low-dispersion
Mode-selective transmission lines (MSTLs) offer low-loss and low-dispersion characteristics, making them suitable for high-performance signal transmission. These lines switch modes based on frequency, starting with a quasi-TEM mode at lower frequencies and transitioning to a quasi-TE10 mode at higher frequencies. Experimental results confirm that MSTLs provide efficient mode conversion and maintain low-loss behavior, supporting their use in super-broadband and ultra-fast pulse propagation applications 3.
Transmission Mode Selection in Small Cell Networks
Keywords: small cell networks, D2D communication, transmission mode selection
In small cell networks enhanced with device-to-device (D2D) communication, there are two primary transmission modes: indirect transmission via a small cell base station (SBS) and direct transmission. Indirect transmission is interference-free but may be inefficient due to high resource consumption and latency. Direct transmission, while potentially faster, is subject to interference. Users must choose the optimal mode in a distributed manner without prior information, balancing utility and efficiency 4.
Dynamic Transmission Mode Selection for Multi-Modal Services
Keywords: multi-modal services, dynamic transmission, optimization algorithm
Emerging multi-modal services, which integrate haptic signals with audio-video signals, require dynamic transmission strategies to meet diverse requirements such as low latency, high reliability, and high throughput. A proposed strategy involves three transmission modes tailored to different service types, with an improved multi-objective optimization algorithm (NSGA3) for mode selection and resource allocation. This approach enhances communication performance and resource utilization efficiency 5.
Evolution of Transmission Modes
Keywords: evolutionary mechanisms, transmission modes, pathogen-host interactions
The evolution of transmission modes in pathogens and hosts is influenced by genetic control and trade-offs. Transmission modes can vary among pathogen strains and host populations, often evolving through host shifts and complex life cycles. Theoretical models combining epidemiology and population genetics provide insights into the conditions under which new transmission modes may evolve, though empirical data is still needed to validate these models 6.
Mode-Insensitive Wired Communication
Keywords: mode-insensitive communication, MIMO, multimode transmission lines
A mode-insensitive wired communication method using MIMO and multimode transmission lines can improve communication capacity and reduce mode sensitivity. By treating multiple eigenmodes as independent paths, this method simplifies design and provides a time-invariant channel, requiring low overhead. Simulations confirm that this approach effectively enhances communication performance 7.
Asymmetric Mode-Converting Transmission
Keywords: asymmetric transmission, mode-converting metamaterial, elastic waves
Asymmetric transmission, where wave energy propagates in only one direction, can be achieved using mode-converting metamaterials. These materials allow full-power mode conversion from longitudinal to transverse waves in one direction while restricting transmission in the opposite direction. This design is simple to fabricate and has been validated through ultrasonic experiments, offering potential applications in diode-like meta-devices for wave manipulation 10.
Conclusion
The study of transmission modes spans various fields, from optical fibers and wireless communication to pathogen-host interactions. Advances in mode-multiplexed transmission, dual-circular-polarized OAM, and mode-selective transmission lines highlight the potential for increased data rates, improved efficiency, and new applications. Understanding and optimizing transmission modes remain critical for the development of high-performance communication systems and the management of disease transmission.
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