Signal-to-noise ratio improvement of photonic time-stretch coherent radar enabling high-sensitivity ultrabroad W-band operation

The signal-to-noise ratio (SNR) of the photonic time-stretching receiver in the photonic time-stretch coherent radar (PTS-CR) system is theoretically analyzed. According to the analysis based on the erbium-doped fiber amplifier (EDFA) characteristic, it is found that the SNR is dominantly determined...

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Bibliographic Details
Published in:Optics letters 2018-12, Vol.43 (23), p.5869-5872
Main Authors: Qian, Na, Zou, Weiwen, Zhang, Siteng, Chen, Jianping
Format: Article
Language:English
Subjects:
Bandwidths
Coherent radar
Doped fibers
Erbium
Extremely high frequencies
Photonics
Radar detection
Sensitivity enhancement
Signal to noise ratio
Stretching
Target detection
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Summary:The signal-to-noise ratio (SNR) of the photonic time-stretching receiver in the photonic time-stretch coherent radar (PTS-CR) system is theoretically analyzed. According to the analysis based on the erbium-doped fiber amplifier (EDFA) characteristic, it is found that the SNR is dominantly determined by the input optical power of the EDFA. With the improvement of the SNR of the photonic time-stretching receiver, the radar detection sensitivity is consequently enhanced. Furthermore, a PTS-CR system operating at W band with the ultrabroad bandwidth of 12 GHz is experimentally enabled, leading to the range resolution of ∼1.48  cm in dual-target detection.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.43.005869