Low-noise amplification of high-power pulses in multimode fibers

1999 ◽  
Vol 11 (6) ◽  
pp. 650-652 ◽  
Author(s):  
M. Hofer ◽  
M.E. Fermann ◽  
A. Galvanauskas ◽  
D. Harter ◽  
R.S. Windeler
Keyword(s):  
High Power ◽  
Low Noise ◽  
Multimode Fibers ◽  
Noise Amplification

scholarly journals S-band hybrid amplifiers based on hydrogenated diamond FETs

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Walter Ciccognani ◽  
Sergio Colangeli ◽  
Claudio Verona ◽  
Fabio Di Pietrantonio ◽  
Domenico Cannatà ◽  
...  
Keyword(s):  
High Power ◽  
Noise Figure ◽  
Low Noise ◽  
The Other ◽  
Two Stage ◽  
Microwave Frequencies ◽  
High Power Operation ◽  
Power Operation ◽  
Two Stages ◽  
Noise Amplification

Abstract The first realizations of S-band hybrid amplifiers based on hydrogenated-diamond (H-diamond) FETs are reported. As test vehicles of the adopted H-diamond technology at microwave frequencies, two designs are proposed: one, oriented to low-noise amplification, the other, oriented to high-power operation. The two amplifying stages are so devised as to be cascaded into a two-stage amplifier. The activities performed, from the technological steps to characterization, modelling, design and realization are illustrated. Measured performance demonstrates, for the low-noise stage, a noise figure between 7 and 8 dB in the 2–2.5 GHz bandwidth, associated with a transducer gain between 5 and 8 dB. The OIP3 at 2 GHz is 21 dBm. As to the power-oriented stage, its transducer gain is 5–6 dB in the 2–2.5 GHz bandwidth. The 1-dB output compression point at 2 GHz is 20 dBm whereas the OIP3 is 33 dBm. Cascading the measured S-parameters of the two stages yields a transducer gain of 15 ± 1.2 dB in the 2–3 GHz bandwidth.

High power and very low noise operation at 1.3 and 1.5 μm with quantum dot and quantum dash Fabry-Perot lasers for microwave links

2006 ◽  
Author(s):  
Patrick Resneau ◽  
Michel Calligaro ◽  
Michel Krakowski ◽  
Huiyun Liu ◽  
Mark Hopkinson ◽  
...  
Keyword(s):  
Quantum Dot ◽  
High Power ◽  
Low Noise ◽  
Fabry Perot ◽  
Quantum Dash

Study on high power microwave nonlinear effects and degradation characteristics of C-band low noise amplifier

2022 ◽  
Vol 128 ◽  
pp. 114427
Author(s):  
Li Fuxing ◽  
Chai Changchun ◽  
Wu Han ◽  
Wang Lei ◽  
Liang Qishuai ◽  
...  
Keyword(s):  
High Power ◽  
Nonlinear Effects ◽  
Low Noise ◽  
Low Noise Amplifier ◽  
High Power Microwave ◽  
Noise Amplifier ◽  
Power Microwave

Progress on High-Power Low-Noise Continuous-Wave Single-Frequency All-Solid-State Lasers

2021 ◽  
Vol 48 (5) ◽  
pp. 0501002
Author(s):  
张宽收 Zhang Kuanshou ◽  
卢华东 Lu Huadong ◽  
李渊骥 Li Yuanji ◽  
冯晋霞 Feng Jinxia
Keyword(s):  
Solid State ◽  
High Power ◽  
Continuous Wave ◽  
Low Noise ◽  
Single Frequency ◽  
Solid State Lasers

scholarly journals Experimental Implementation of a Low-Cost, Fully-Analog Self-Jamming Canceller for UHF RFID Devices

Electronics ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 786 ◽  
Author(s):  
Massimiliano Rossi ◽  
Riccardo Liberati ◽  
Marco Frasca ◽  
John Richardson
Keyword(s):  
Low Cost ◽  
Low Noise ◽  
Modular System ◽  
Uhf Rfid ◽  
Rf Receiver ◽  
Experimental Implementation ◽  
And Performance ◽  
Modular Technology ◽  
Noise Amplification ◽  
Theoretical Simulations

It is quite common for transceivers to operate with the RF receiver and transmitter working on different time slots. Typical applications are radars and transceivers in the field of communications. Generally, the receiver is turned off when the transmitter broadcasts and vice versa. This is done in order to prevent the transmitter from blinding the receiver or causing the RF low noise amplification (LNA) stage to saturate. When keeping a receiver active, some leakage of RF energy is inevitable, and therefore shielding is applied to mitigate spurious signals. However, there are many applications wherein the receiver cannot be turned off. To address these applications, we investigate the design and performance of a fully-analog self-jamming canceller able to operate in UHF (Ultra High Frequency) RFID devices. While the traditional cost to design and build this type of topology can be quite high, our proposal is based on a low-cost physical approach. In addition to using common SMT (Surface Mount Technology) devices, we leveraged a new piece of modular technology offered by X-Microwave which allows designers to easily produce RF solutions with a broad portfolio of modular system drop-in blocks. A prototype was realized and the measured results are in close agreement with theoretical simulations. Significant damping of the leaked signal in the receiving channel was realized.

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