Experimental scheme and noise analysis of weak-light phase locked loop for large-scale intersatellite laser interferometer

2021 ◽  
Vol 92 (12) ◽  
pp. 124501
Author(s):  
Yu-Rong Liang ◽  
Yu-Jie Feng ◽  
Guo-Yao Xiao ◽  
Yuan-Ze Jiang ◽  
Lin Li ◽  
...  
Keyword(s):  
Large Scale ◽  
Laser Interferometer ◽  
Noise Analysis ◽  
Phase Locked Loop ◽  
Light Phase ◽  
Experimental Scheme ◽  
Weak Light

scholarly journals A simulation of weak-light phase-locking for space laser interferometer

2017 ◽  
Vol 840 ◽  
pp. 012049
Author(s):  
Y Q Li ◽  
Y H Dong ◽  
H S Liu ◽  
Z R Luo ◽  
G Jin
Keyword(s):  
Laser Interferometer ◽  
Phase Locking ◽  
Light Phase ◽  
Weak Light

Ultrasensitive broadband photodetectors based on two-dimensional Bi2O2Te films

2021 ◽  
Author(s):  
Pin Tian ◽  
Hongbo Wu ◽  
Libin Tang ◽  
Jinzhong Xiang ◽  
Rongbin Ji ◽  
...  
Keyword(s):  
Large Scale ◽  
2D Materials ◽  
Complementary Metal Oxide Semiconductor ◽  
Cmos Technology ◽  
Photocurrent Density ◽  
Short Wave ◽  
Oxide Semiconductor ◽  
Light Illumination ◽  
Two Dimensional ◽  
Weak Light

Abstract Two-dimensional (2D) materials exhibit many unique optical and electronic properties that are highly desirable for application in optoelectronics. Here, we report the study of photodetector based on 2D Bi2O2Te grown on n-Si substrate. The 2D Bi2O2Te material was transformed from sputtered Bi2Te3 ultrathin film after rapid annealing at 400 ℃ for 10 min in air atmosphere. The photodetector was capable of detecting a broad wavelength from 210 nm to 2.4 μm with excellent responsivity of up to 3x105 and 2x104 AW-1, and detectivity of 4x1015 and 2x1014 Jones at deep ultraviolet (UV) and short-wave infrared (SWIR) under weak light illumination, respectively. The effectiveness of 2D materials in weak light detection was investigated by analysis of the photocurrent density contribution. Importantly, the facile growth process with low annealing temperature would allow direct large-scale integration of the 2D Bi2O2Te materials with complementary metal-oxide–semiconductor (CMOS) technology.

Imaging the Nechako Basin, British Columbia, using ambient seismic noise1This article is one of a series of papers published in this Special Issue on the theme of New insights in Cordilleran Intermontane geoscience: reducing exploration risk in the mountain pine beetle-affected area, British Columbia.

2011 ◽  
Vol 48 (6) ◽  
pp. 1038-1049 ◽  
Author(s):  
O.A. Idowu ◽  
A.W. Frederiksen ◽  
J.F. Cassidy
Keyword(s):  
British Columbia ◽  
Surface Wave ◽  
Group Velocity ◽  
Large Scale ◽  
Green's Functions ◽  
Green’S Functions ◽  
Noise Analysis ◽  
Sedimentary Basins ◽  
Seismic Exploration ◽  
Velocity Models

The Nechako Basin in British Columbia, Canada is suspected to have hydrocarbon potential. However, it has been a difficult basin to explore because of the presence of Tertiary volcanic outcrop. The volcanic outcrop makes the use of conventional seismic exploration methods difficult owing to a strong velocity inversion at its base. An alternative is the passive source method known as ambient noise surface wave tomography. The method, which examines the high-frequency surface wave field that is obtained from noise analysis, is sensitive to large-scale crustal structure and has been successfully applied to measuring the depths of sedimentary basins. Station-to-station Green’s functions within the basin were estimated by cross-correlating the vertical components of the seismic noise data recorded by 12 POLARIS (Portable Observatories for Lithosphere Analysis and Research Investigating Seismicity) and CNSN (Canadian National Seismgraph Network) seismic stations between September 2006 and November 2007. The resulting Green’s functions were dominated by Rayleigh waves. The dispersion characteristics of the Rayleigh waveforms were measured within the microseismic band. Inversion of the dispersion curves produced 1-D and 2-D thickness models and 2-D group velocity models for the Nechako Basin and its surrounding region. The velocity models indicate two low group velocity structures within the basin that might represent sedimentary packages, and some pockets of high-velocity zones that show the presence of volcanic rocks within and on the basin. The thickness models indicated the presence of about six different velocity layers, in which the average thickness of the basin and the crust are ∼4.8 and 30–34 km, respectively.

512 Aerodynamics Noise Analysis of Large-scale Wind Turbine

2008 ◽  
Vol 2008 (0) ◽  
pp. 123-124
Author(s):  
NUR AKMAL BINTI HANIFFAH ◽  
Terumi INAGAKI ◽  
Tsutomu TACHIKAWA ◽  
Keisuke IINO
Keyword(s):  
Wind Turbine ◽  
Large Scale ◽  
Noise Analysis

Methodology for Efficient Substrate Noise Analysis in Large-Scale Mixed-Signal Circuits

2009 ◽  
Vol 17 (10) ◽  
pp. 1405-1418 ◽  
Author(s):  
E. Salman ◽  
R. Jakushokas ◽  
E.G. Friedman ◽  
R.M. Secareanu ◽  
O.L. Hartin
Keyword(s):  
Large Scale ◽  
Noise Analysis ◽  
Substrate Noise ◽  
Mixed Signal ◽  
Mixed Signal Circuits

scholarly journals Noise Analysis of a Passive Resonant Laser Gyroscope

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5369
Author(s):  
Kui Liu ◽  
Fenglei Zhang ◽  
Zongyang Li ◽  
Xiaohua Feng ◽  
Ke Li ◽  
...  
Keyword(s):  
Large Scale ◽  
Free Spectral Range ◽  
Noise Analysis ◽  
Ring Cavity ◽  
Frequency Discrimination ◽  
Frequency Range ◽  
Noise Sources ◽  
Noise Transfer Function ◽  
Resonant Laser ◽  
Laser Gyroscope

Large-scale laser gyroscopes have found important applications in Earth sciences due to their self-sufficient property of measurement of the Earth’s rotation without any external references. In order to extend the relative rotation measurement accuracy to a better level so that it can be used for the determination of the Earth orientation parameters (EOP), we investigate the limitations in a passive resonant laser gyroscope (PRG) developed at Huazhong University of Science and Technology (HUST) to pave the way for future development. We identify the noise sources from the derived noise transfer function of the PRG. In the frequency range below 10−2Hz, the contribution of free-spectral-range (FSR) variation is the dominant limitation, which comes from the drift of the ring cavity length. In the 10−2 to 103Hz frequency range, the limitation is due to the noises of the frequency discrimination system, which mainly comes from the residual amplitude modulation (RAM) in the frequency range below 2 Hz. In addition, the noise contributed by the Mach–Zehnder-type beam combiner is also noticeable in the 0.01 to 2 Hz frequency range. Finally, possible schemes for future improvement are also discussed.

Weak-light phase tracking with a low cycle slip rate

2014 ◽  
Vol 39 (18) ◽  
pp. 5251 ◽  
Author(s):  
Samuel P. Francis ◽  
Timothy T-Y. Lam ◽  
Kirk McKenzie ◽  
Andrew J. Sutton ◽  
Robert L. Ward ◽  
...  
Keyword(s):  
Slip Rate ◽  
Cycle Slip ◽  
Light Phase ◽  
Phase Tracking ◽  
Weak Light

PICO-WATT AND FEMTO-WATT WEAK-LIGHT PHASE LOCKING

2002 ◽  
Vol 11 (07) ◽  
pp. 1075-1085 ◽  
Author(s):  
AN-CHI LIAO ◽  
WEI-TOU NI ◽  
JOW-TSONG SHY
Keyword(s):  
Light Beam ◽  
Phase Locking ◽  
Phase Error ◽  
Light Phase ◽  
Long Distance ◽  
Strong Light ◽  
Loop Filter ◽  
Phase Lock ◽  
Laser Signal ◽  
Weak Light

Advances in laser physics and its applications have triggered the proposition and development of Laser Astrodynamics. In carrying out research projects on Laser Space Programs, it is necessary to process the laser signal sent back from remote spacecraft. After traveling an extremely long distance, the power of this signal is greatly reduced. Weak-light phase-locking is the key technique used for signal amplification in these space projects. After the returning laser beam is collected by telescope, it is used to phase-lock a local laser oscillator. The local laser then carries the phase information of the remote spacecraft laser. we used diode-pumped non-planar ring cavity Nd:YAG lasers to serve as the remote weak-light laser and the local strong-light laser. We then built an optical phase-locked loop to phase-lock them. The weak-light laser signal was simulated using ND (neutral density)-filters to decrease the light intensity. In the phase detection, we used balanced detection to eliminate laser intensity noise and improve the S/N ratio. Combining this with an appropriate loop filter, we were able to control the laser frequency and improve the phase-locking ability. We phase-locked a 2 nW weak-light beam and a 2 mW strong-light beam with a 57 mrads(rms)phase error. The locking duration was very long. Locking of a 200 pW and a 2007thinsp;μW light beam, with phase error of 200 mrad (rms) and duration of over 2 hours was achieved. The phase error for locking a 200 μW to a 20pW light beam was 160 mrad (rms). The locking duration was also longer than 2 hours. the last locking performed was carried out with a 2 pW and a 200 μW light beam. The phase error and the locking duration were 290 mrad(rms) and 1.5 min respectively.

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