power amplifier
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Laser Physics ◽  
2022 ◽  
Vol 32 (2) ◽  
pp. 025103
H M Park ◽  
Y J Oh ◽  
E J Park ◽  
J S Park ◽  
H Jeong ◽  

Abstract A high-power master-oscillator power-amplifier (MOPA) at 1018 nm employing ytterbium (Yb)-doped fibres as a gain medium is reported. Utilizing a diffraction grating as a reflector, we could successfully suppress the influence of the broadband amplified spontaneous emission on the master-oscillator or the power-amplifier, resulting in stable amplification of the laser signal at 1018 nm. Based on a simple theoretical simulation on gain spectra and experimental investigation on parasitic lasing thresholds, the Yb fibre MOPA constructed in-house yielded 220 W of output at 1018 nm with a beam propagation factor (M2) of 1.1. The prospects for further power scaling are considered.

2022 ◽  
Fei Yang ◽  
Jun Li ◽  
Hongxi Yu ◽  
Kang Yin ◽  
Hengfei Zhao ◽  

Electronics ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 144
Xiaopan Chen ◽  
Yongle Wu ◽  
Weimin Wang

This study presents a dual-band power amplifier (PA) with two output ports using a simplified three-port, frequency-dividing matching network. The dual-band, dual-output PA could amplify a dual-band signal with one transistor, and the diplexer-like output matching network (OMN) divided the two bands into different output ports. A structure consisting of a λ/4 open stub and a λ/4 transmission line was applied to restrain undesired signals, which made each branch equivalent to an open circuit at another frequency. A three-stub design reduced the complexity of the OMN. Second-order harmonic impedances were tuned for better efficiency. The PA was designed with a 10-W gallium nitride high electron mobility transistor (GaN HEMT). It achieved a drain efficiency (DE) of 55.84% and 53.77%, with the corresponding output power of 40.22 and 40.77 dBm at 3.5 and 5.0 GHz, respectively. The 40%-DE bandwidths were over 200 MHz in the two bands.

Integration ◽  
2022 ◽  
Tahesin Samira Delwar ◽  
Abrar Siddique ◽  
Manas Ranjan Biswal ◽  
Prangyadarsini Behera ◽  
Ahmed Nabih Zaki Rashed ◽  

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