Results 11 to 20 of about 35,461 (260)

Faint Echo Extraction from ALB Waveforms Using a Point Cloud Semantic Segmentation Model

Remote Sensing, 2023
As an active remote sensing technology, airborne LIDAR can work at all times while emitting specific wavelengths of laser light that can penetrate seawater.
Yifan Huang, Yan He, Xiaolei Zhu, Jiayong Yu, Yongqiang Chen   +4 more
doaj   +1 more source

Sensitivity Deterioration of Free-Space Optical Coherent/Non-Coherent OOK Modulation Receiver by Ambient Light Noise

Sensors, 2023
In free-space optical (FSO) communication systems, on–off keying (OOK) is a widely used modulation format. Coherent and non-coherent OOK receivers with sensitivities of −54.60 dBm and −51.25 dBm, respectively, were built with a communication rate of 1 ...
Weijie Ren, Jianfeng Sun, Haisheng Cong, Yuxin Jiang   +3 more
doaj   +1 more source

Absolutely Consistent Fiber-Optic Phase Synchronization Based On Fixed-Phase-Reference Optical Active Compensation

IEEE Photonics Journal, 2021
An absolutely consistent fiber-optic phase synchronization scheme based on fixed-phase-reference optical active compensation is proposed. By measuring the time interval of time pulse and the phase difference of frequency signal, and then using the ...
Rui Wu, Fei Yang, Yanguang Sun, Fang Wei, Youzhen Gui, Yaqian Ding, Haiwen Cai   +6 more
doaj   +1 more source

Performance Improvement of Spaceborne Carbon Dioxide Detection IPDA LIDAR Using Linearty Optimized Amplifier of Photo-Detector

Remote Sensing, 2021
The spaceborne double-pulse integrated-path differential absorption (IPDA) light detection and ranging (LIDAR) system was found to be helpful in observing atmospheric CO2 and understanding the carbon cycle.
Yadan Zhu, Juxin Yang, Xiaoxi Zhang, Jiqiao Liu, Xiaopeng Zhu, Huaguo Zang, Tengteng Xia, Chuncan Fan, Xiao Chen, Yanguang Sun, Xia Hou, Weibiao Chen   +11 more
doaj   +1 more source

Recent Progress in Distributed Fiber Acoustic Sensing with Φ-OTDR

Sensors, 2020
Distributed fiber acoustic sensing (DAS) technology can continuously spatially detect disturbances along the sensing fiber over long distance in real time.
Zhaoyong Wang, Bin Lu, Qing Ye, Haiwen Cai   +3 more
doaj   +1 more source

2.4-W Narrow-Linewidth Q-Switched $\hbox{Tm}^{3+}$ -Doped Double-Clad Fiber Laser

IEEE Photonics Journal, 2013
A narrow-linewidth 793-nm diode-pumped Tm3+ -doped double-clad silica fiber laser operated at 2 μm and actively Q-switched with an acousto-optic modulator is reported.
Qijie Huang, Ting Yu, Yameng Zheng, Jifeng Zu, Weibiao Chen   +4 more
doaj   +1 more source

A Dual-Wavelength Ocean Lidar for Vertical Profiling of Oceanic Backscatter and Attenuation

Remote Sensing, 2020
Ocean water column information profiles are essential for ocean research. Currently, water column profiles are typically obtained by ocean lidar instruments, including spaceborne, airborne and shipborne lidar, most of which are equipped with a 532 nm ...
Kaipeng Li, Yan He, Jian Ma, Zhengyang Jiang, Chunhe Hou, Weibiao Chen, Xiaolei Zhu, Peng Chen, Junwu Tang, Songhua Wu, Fanghua Liu, Yuan Luo, Yufei Zhang, Yongqiang Chen   +13 more
doaj   +1 more source

Multiple-wavelength free-space laser communications [PDF]

SPIE Proceedings, 2003
Free-space optical communications systems in the atmosphere, based on intensity modulation and direct detection, are heavily affected by fading caused by turbulence cells of varying scale and motion. Several data sets of fading measurements under different scenarios have been recorded demonstrating this effect. In this paper we introduce a form of free-
Purvinskis, Robert, Giggenbach, Dirk, Henniger, Hennes, Perlot, Nicolas, David, Florian   +4 more
openaire   +2 more sources

Monitoring of Atmospheric Carbon Dioxide over a Desert Site Using Airborne and Ground Measurements

Remote Sensing, 2022
Accurate monitoring of atmospheric carbon dioxide (CO2) is of great significance for studying the carbon cycle. Compared to ground observational sites, airborne observations cover a wider area, which help in effectively monitoring the distribution of CO2
Qin Wang, Farhan Mustafa, Lingbing Bu, Juxin Yang, Chuncan Fan, Jiqiao Liu, Weibiao Chen   +6 more
doaj   +1 more source

High-Gain Optical Injection Locking Amplifier in Phase-Coherent Optical Frequency Transmission

IEEE Photonics Journal, 2019
Optical amplification, which is necessary for extending the distance of optical frequency transfer, has a significant impact on the transmission performance.
Zitong Feng, Xi Zhang, Rui Wu, Yanguang Sun, Fang Wei, Fei Yang, Youzhen Gui, Haiwen Cai   +7 more
doaj   +1 more source