Results 21 to 30 of about 2,312,417 (278)

Small UAS Online Audio DOA Estimation and Real-Time Identification Using Machine Learning

Sensors, 2022
The wide range of unmanned aerial system (UAS) applications has led to a substantial increase in their numbers, giving rise to a whole new area of systems aiming at detecting and/or mitigating their potentially unauthorized activities.
Alexandros Kyritsis, Rodoula Makri, Nikolaos Uzunoglu   +2 more
doaj   +1 more source

Fiber Lens Based Optical Antenna Design for OWC With Full Beam Coverage

IEEE Photonics Journal, 2021
In infrared optical wireless communications, narrow beams require the perfect calibration of the base station (BS) and user terminal (UT), which cannot support multiple moving users. This paper proposes a fiber lens based optical antenna, which employs a
Chen Sun, Jia Zhao, Jiaheng Wang, Xiqi Gao   +3 more
doaj   +1 more source

Spatially Resolved Brillouin Spectral Hole Burning in PMF and SMF

IEEE Photonics Journal, 2018
We observe the spectral hole burning effect in a polarization maintain fiber (PMF) and a single-mode fiber (SMF) through the interaction between a continuous wave (CW) beam and a high power pulse with two frequency components located around the Stokes ...
Xiaoxuan Zhong, Hao Liang, Linghao Cheng, Jie Li, Liang Chen, Xiaoyi Bao, Bai-ou Guan   +6 more
doaj   +1 more source

A MMIC QPSK Modulator

Active and Passive Electronic Components, 2002
In this paper a MMIC QPSK modulator is described. The bit rate of the baseband signal is 155 Mbits/sec, while the frequency of the carrier is fLO=10 GHz . The modulation is performed directly at the RF band and therefore an IF stage is not necessary. The
Petros S. Tsenes, Giorgos E. Stratakos, S. Nikolaos, K. Uzunoglu   +3 more
doaj   +1 more source

X-Band MMIC Active Mixers

Active and Passive Electronic Components, 2002
In this paper two active MMIC mixers for RF front-end applications are described. A down-converter that converts an RF signal (fRF=10.45 GHz) into an IF signal (fIF=0.95 GHz) using an LO signal (fLO=9.5 GHz) and an up-converter that performs the ...
Ptros S. Tsenes, Giorgos E. Stratakos, Nikolaos K. Uzunoglu   +2 more
doaj   +1 more source

Angular Momentum-Dependent Transmission of Circularly Polarized Vortex Beams Through a Plasmonic Coaxial Nanoring

IEEE Photonics Journal, 2018
In this paper, we report on the theoretical and numerical study of the transmission of circularly polarized vortex beams through a plasmonic coaxial nanoring.
Shuai Wang, Zi-Lan Deng, Yaoyu Cao, Dejiao Hu, Yi Xu, Boyuan Cai, Long Jin, Yuan Bao, Xiaolei Wang, Xiangping Li   +9 more
doaj   +1 more source

Arbitrary polarization conversion dichroism metasurfaces for all-in-one full Poincaré sphere polarizers

Light: Science & Applications, 2021
The control of polarization, an essential property of light, is of broad scientific and technological interest. Polarizers are indispensable optical elements for direct polarization generation.
Shuai Wang, Zi-Lan Deng, Yujie Wang, Qingbin Zhou, Xiaolei Wang, Yaoyu Cao, Bai-Ou Guan, Shumin Xiao, Xiangping Li   +8 more
doaj   +1 more source

UV generation in a pure-silica holey fiber [PDF]

, 2003
We report supercontinuum generation extending to 300nm in the UV from a pure-silica holey fiber. The broad spectrum was obtained by launching ultra-short pulses (~150fs, 10nJ at 820nm) from an amplified Ti:sapphire laser.
J.J. Baumberg, J.H.V. Price, Baumberg, J.J., Richardson, D.J., J.C. Baggett, Paschotta, R., W. Belardi, Price, J.H.V., Baggett, J.C., Coyle, S., R. Paschotta, D.J. Richardson, Monro, T.M., S. Coyle, Netti, C., Richardson, D., Monro, T., Price, J., Belardi, W., T.M. Monro, Furusawa, K., Baggett, J., K. Furusawa, Baumberg, J., C. Netti, Belardi W, Paschotta R, Price JHV, Netti C, Furusawa K, Baggett JC, Coyle S, Richardson DJ, Monro TM, Baumberg JJ   +34 more
core   +1 more source

Quantum Dot Coherent Comb Laser Source for Converged Optical-Wireless Access Networks

IEEE Photonics Journal, 2021
We propose and experimentally demonstrate a converged optical-wireless WDM access network architecture enabled by a highly integrated quantum dot coherent comb laser.
Haipeng Zhang, Mu Xu, Zhensheng Jia, Luis Alberto Campos, Zhenguo Lu, Chun-Ying Song, Pedro Barrios, Mohamed Rahim, Ping Zhao, Philip J. Poole   +9 more
doaj   +1 more source

Enabling Technology in Optical Fiber Communications: From Device, System to Networking [PDF]

, 2021
This book explores the enabling technology in optical fiber communications. It focuses on the state-of-the-art advances from fundamental theories, devices, and subsystems to networking applications as well as future perspectives of optical fiber ...

core   +1 more source