Results 251 to 260 of about 33,221 (289)

Spin-Injected Birefringent VCSELs for Analog Radio-Over-Fiber Systems

IEEE Photonics Technology Letters, 2021
We propose and numerically investigate the use of birefringent vertical-cavity surface-emitting lasers (VCSELs) under the injection and modulation of spin polarized electrons for application to analog radio over fiber (RoF) systems. Injection current and electron spin polarization in a birefringent VCSEL are individually modulated for generating data ...
Nobuhide Yokota, Kazuhiro Ikeda, Hiroshi Yasaka   +2 more
openaire   +1 more source

Analog receiver for coherent optical analog radio-over-fiber transmission

Optics Letters, 2017
A receiver for low-cost coherent optical applications is presented. Conceptual simplicity is guaranteed through the use of a monolithic integrated externally modulated laser. Local oscillators and fast photodetectors are provided by the distributed feedback section and electro-absorption modulator of the monolithic laser. The injection-locking feature,
Bernhard, Schrenk, Markus, Hofer, Thomas, Zemen   +2 more
openaire   +2 more sources

Analog Radio-over-Fiber 5G Fronthaul Systems: blueSPACE and 5G-PHOS Projects Convergence

2019 European Conference on Networks and Communications (EuCNC), 2019
The fifth generation (5G) mobile systems can be considered the way to ubiquitous Internet, pervasive computing paradigm, and a revolution in industries like automotive, media and entertainment, and eHealth. New 5G fronthaul systems based on centralized radio access networks will eventually use technology enablers such as reconfigurable optical add-drop
Raddo, Thiago R., Rommel, Simon, Monroy, Idelfonso Tafur, Vagionas, Chris, Kalfas, George, Pleros, Nikos   +5 more
openaire   +3 more sources

Analog radio-over-fiber solutions in support of 5G

2018 International Conference on Optical Network Design and Modeling (ONDM), 2018
We introduce Centralized (C-RAN) architectures combined with analog optical transport schemes to realize high-speed lanes between BBU pool and RRHs. The DSP-enabled architecture relies on the use of a powerful digital engine supporting data plane functions for both fiber-wireless parts.
Apostolopoulos, D., Giannoulis, G., Argyris, N., Iliadis, N., Kanta, K., Avramopoulos, H.   +5 more
openaire   +1 more source

Linearized Electro-Optical Modulation for Analog Radio over Fiber

Fiber and Integrated Optics, 2018
ABSTRACTIntermodulation distortion (IMD) in Analog Radio-over-Fiber (a-RoF) poses a severe limitation to achievable error-free transmission. In this work, an optical feed-forward linearization scheme is presented and compared to an electrical pre-distortion solution.
Luis Ernesto Ynoquio Herrera, Renata Goldman Leibel, Gustavo Castro do Amaral, Patryk Jay Urban, Jean Pierre von der Weid   +4 more
openaire   +1 more source

Analog Radio-over-Fiber Based Mobile Fronthaul Toward Beyond-5G Era

2020 International Topical Meeting on Microwave Photonics (MWP), 2020
This paper describes the background, motivation, approach and experimental results of our research and development of mobile fronthaul based on analog radio-over-fiber and related optical transmission technique. Future evolution scenario toward Beyond-5G era is also discussed.
Kosuke Nishimura, Shota Ishimura, Hsuan-Yun Kao, Kazuki Tanaka, Ryo Inohara   +4 more
openaire   +1 more source

Spin-VCSELs for analog radio-over-fiber systems in 5G and beyond

Spintronics XIV, 2021
We investigate the applicability of spin-controlled vertical-cavity surface-emitting lasers (spin-VCSELs) for optical transmitters in analog radio-over-fiber systems by using spin-flip rate equations. In addition to the current modulation for generating orthogonal frequency division multiplexing (OFDM) signals, we use the spin polarization modulation ...
Nobuhide Yokota, Kazuhiro Ikeda, Hiroshi Yasaka   +2 more
openaire   +1 more source

Novel broadband analog predistortion circuit for radio-over-fiber systems

2015 IEEE MTT-S International Microwave Symposium, 2015
A novel broadband analog predistortion circuit (PDC) is designed to linearize radio-over-fiber (RoF) systems. Dual Schottky diode is used as predistorter. The PDC with high bandwidth and small dimension is achieved by removing quarter-wavelength transformers and power dividers.
Ran Zhu, null Zichen Xuan, null Ye Zhang, Xiupu Zhang, Dongya Shen   +4 more
openaire   +1 more source

Linearization techniques for electro-optical modulation in analog radio over fiber

2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC), 2017
Analog Radio-over-Fiber (a-RoF) has gained increasing attention in the context of next-generation optical networks due to its spectral efficiency and lower deployment cost. However, electro-optical conversion of the information signal is delicate since the non-linear characteristic of the electro-optical modulator's transfer function causes inter ...
L.E. Ynoquio Herrera, R.G. Leibel, G.C. Amaral, J.P. von der Weid, P.J. Urban   +4 more
openaire   +1 more source

Analog Radio over Fiber Links for Future 5G Radio Access Networks

2019 21st International Conference on Transparent Optical Networks (ICTON), 2019
Bandwidth constraint in the radio access networks is, nowadays, a mayor problem in the implementation of next generation 5G mobile communications. In order to cope with increasing bandwidth demands, the use of the millimeter-wave (mmWave) spectrum, together with Radio over Fiber (RoF) technology has been proposed.
Diego Perez-Galacho, Demetrio Sartiano, Salvador Sales   +2 more
openaire   +1 more source