Results 71 to 80 of about 2,964 (249)

High-power dense wavelength division multiplexing of multimode diode laser radiation based on volume Bragg gratings

, 2022
S.3154-3157We present a dense wavelength division multiplexer based on volume Bragg gratings (VBGs) with a channel spacing of Delta lambda = 1.5 nm. Multiplexing efficiencies of eta(SM) = 97% have been demonstrated with single-mode, frequency-stabilized ...
Krauch, N., Traub, M., Hoffmann, D., Witte, U., Hengesbach, S., Holly, C.   +5 more
core   +1 more source

Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems

Advanced Electronic Materials, EarlyView.
Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang, Weipeng Wang, Xuan Cong, Shiyu Wang, Gao Li, Sen Gong, Lin Huang, Hongxin Zeng, Yaxin Zhang, Ziqiang Yang   +9 more
wiley   +1 more source

Analisis Kinerja Teknologi Dense Wavelength Division Multiplexing (DWDM) Studi Kasus PT. Excelcomindo Pratama [PDF]

, 2010
Saluran transmisi adalah media yang berfungsi untuk mentransmisikan sinyal informasi dari pemancar ke penerima. Salman transmisi yang digunakan pada umumnya adalah kabel coaxial, gelombang radio dan serat optik.
Andika, Fery
core  

A Simple and General Analytical Expression for Calculating Crosstalk in Multiwaveguide Directional Couplers Using Finite Differences Method

Journal of Kufa-Physics, 2020
In optical communication systems, the main aim is to control and limit the unwanted Crosstalk (CT) effects on wavelength divisions multiplexing (WDM) channel, which degrade the transmission performance.
Sabah M.M. Ameen M.M. Ameen, Mansour H. Mansour   +1 more
doaj   +1 more source

Fundamental Challenges, Physical Implementations, and Integration Strategies for Ising Machines in Large‐Scale Optimization Tasks

Advanced Electronic Materials, EarlyView.
Ising machines are emerging as specialized hardware solvers for computationally hard optimization problems. This review examines five major platforms—digital CMOS, analog CMOS, emerging devices, coherent optics, and quantum systems—highlighting physics‐rooted advantages and shared bottlenecks in scalability and connectivity.
Hyunjun Lee, Joon Pyo Kim, Sanghyeon Kim
wiley   +1 more source

Applications of perfect difference codes in fiber-optics and wireless optical code-division multiplexing/multiple-access systems

, 2012
After establishing itself in the radio domain, Spread spectrum code-division multiplexing/multiple-access (CDMA) has seen a recent upsurge in optical domain as well.
Umrani, Fahim Aziz
core  

A Performance Comparison of Centralized and Distributed Spectrum Management Techniques in Elastic Optical Networks

Journal of Engineering, 2019
Elastic optical networks (EONs) have emerged to provide higher spectrum efficiency than traditional Dense Wavelength-Division-Multiplexing (DWDM) by utilizing enabling technologies such as flexible spectrum grid, Orthogonal Frequency Division ...
Tushar Mathur, Gokhan Sahin, Donald R. Ucci   +2 more
doaj   +1 more source

Recent Advances in Programmable Metasurfaces and Meta‐Devices

Advanced Electronic Materials, EarlyView.
Programmable metasurfaces enable various novel functionalities by dynamically tuning electromagnetic wavefronts. This article provides a comprehensive review of recent advances in microwave and terahertz programmable metasurfaces, covering electrical, thermal, optical, and mechanical control mechanisms.
Linda Shao, Chong He, Nan Wang, Liming Si, Weiren Zhu   +4 more
wiley   +1 more source

Nanosecond channel-switching exact optical frequency synthesizer using an optical injection phase-locked loop (OIPLL)

, 2004
Experimental results are reported on an optical frequency synthesizer for use in dynamic dense wavelength-division-multiplexing networks, based on a tuneable laser in an optical injection phase-locked loop for rapid wavelength locking.
Duser, M, Lovell, T, Seeds, AJ, Renaud, CC, Silva, CFC, Puttnam, B, Bayvel, P   +6 more
core  

Design of 256-channel 25-GHz AWG for ultra-dense wavelength division multiplexing

, 2022
We present 256-channel, 25-GHz AWG designed for ultra-dense wavelength division multiplexing. For the design two in-house developed tools were used: AWG-Parameters tool for the calculation of input design parameters and AWGAnalyser tool, used to evaluate
Seyringer, Heinz, Seyringer, Dana, Serecunova, Stanislava, Uherek, Frantisek   +3 more
core   +1 more source