- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - Uni-Traveling Carrier Photodiode for High Speed and High Power Application
摘要： A uni-traveling carrier photodiode structure was demonstrated and fabricated. The results show that this structure is suitable for high speed and high power application.
关键词： UTC-PD,high speed,high power
更新于2025-09-19 17:13:59
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[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou, China (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - Bias Modulation Characteristic Analysis Using a Uni-Traveling-Carrier Photodiode
摘要： We theoretically studied the photodiode bias modulation technology. Based on one uni-traveling-carrier photodiode structure, the modulation bandwidth can reach 25 GHz at a 150 GHz subcarrier signal when the incident optical power is 12.93 dBm.
关键词： Radio-over-Fiber (RoF) links,photodiode(PD) bias modulation,uni-traveling-carrier photodiode (UTC-PD)
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Atlanta, GA, USA (2019.7.7-2019.7.12)] 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Full D-band Coplanar to Rectangular Waveguide Transition for UTC-PD Application
摘要： This paper presents a broadband coplanar waveguide (CPW) to rectangular waveguide transition for unitraveling carrier photodiode (UTC-PD) THz source application. The four step Chebyshev ridge waveguide is used to transform the quasi-TEM mode of the CPW to the TE10 mode of the rectangular waveguide, and to widen the transition bandwidth. Simulated results demonstrate that the proposed CPW to waveguide transition covers the whole D band (110-170 GHz), and achieves a wider fractional bandwidth of 43% and lower insertion loss of 0.5 dB.
关键词： transition,rectangular waveguide,UTC-PD,ridge,CPW
更新于2025-09-12 10:27:22
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[IEEE 2019 International Topical Meeting on Microwave Photonics (MWP) - Ottawa, ON, Canada (2019.10.7-2019.10.10)] 2019 International Topical Meeting on Microwave Photonics (MWP) - An Antenna-integrated UTC-PD based Photonic Emitter Array
摘要： In this paper we present a photonics-based wideband emitter module, using two uni-travelling carrier photodiodes coupled to a pair of high gain planar antennas, reporting a two-element array operating in the 50 to 120 GHz frequency range. This antenna array provides a maximum gain of 15.9 dBi with side-lobes less than -15 dB. The measurements show a record 3-dB bandwidth of 45 GHz, covering three waveguide bands (V, E and F). Moreover, a combined peak radiated power of -6.4 dBm (214 (cid:2)W) at 75 GHz is also achieved. The scalable design presented allows for realization of photonic phased antenna array.
关键词： UTC-PD,radio frequency photonics,optoelectronics,antenna array
更新于2025-09-11 14:15:04
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Determination of Global Geodetic Parameters Using Satellite Laser Ranging Measurements to Sentinel-3 Satellites
摘要： Sentinel-3A/3B (S3A/B) satellites are equipped with a number of precise instruments dedicated to the measurement of surface topography, sea and land surface temperatures and ocean and land surface color. The high-precision orbit is guaranteed by three instruments: Global Positioning System (GPS) receiver, laser retroreflector dedicated to Satellite Laser Ranging (SLR) and Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) antenna. In this article, we check the possibility of using SLR observations and GPS-based reduced-dynamic orbits of active S3A/B satellites for the determination of global geodetic parameters, such as geocenter motion, Earth rotation parameters (ERPs) and the realization of the terrestrial reference frame, based on data from 2016-2018. The calculation process was preceded with the estimation of SLR site range biases, different network constraining tests and a different number of orbital arcs in the analyzed solutions. The repeatability of SLR station coordinates based solely on SLR observations to S3A/B is at the level of 8-16 mm by means of interquartile ranges even without network constraining in 7-day solutions. The combined S3A/B and LAGEOS solutions show a consistency of estimated station coordinates better than 13 mm, geocenter coordinates with a RMS of 6 mm, pole coordinates with a RMS of 0.19 mas and Length-of-day with a RMS of 0.07 ms/day when referred to the IERS-14-C04 series. The altimetry observations have to be corrected by the geocenter motion to obtain unbiased estimates of the mean sea level rise. The geocenter motion is typically derived from SLR measurements to passive LAGEOS cannonball-like satellites. We found, however, that SLR observations to active Sentinel satellites are well suited for the determination of global geodetic parameters, such as Earth rotation parameters and geocenter motion, which even further increases the potential applications of Sentinel missions for deriving geophysical parameters.
关键词： reference frame realization,UT1-UTC,geocenter coordinates,low Earth orbiters,polar motion,Satellite Laser Ranging (SLR)
更新于2025-09-11 14:15:04
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Fiber-optic UTC(k) timescale distribution with automated link delay cancelation
摘要： In this paper we describe the idea and practical realization of an automated calibrator of fiber-optic UTC(k) distribution system, along with a high-resolution shifter of 1 PPS signal, which allows to cancel to the propagation delay and thus to produce the 1 PPS at the remote system output with practically zeroed offset. The solution was experimentally verified with ten different optical paths, up to 300 km long. The rms offset of the output timescale in our experiments was 7.1 ps, and maximum absolute value did not exceed 15 ps.
关键词： fiber optics,Delay cancelation,time and frequency transfer,UTC
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Measure of the Absolute Phase Angle of a Power Frequency Sinewave with Respect to UTC
摘要： This paper presents a method to measure the absolute phase angle of a power frequency sinewave with respect to the passage of the UTC second. The need for such a technic arises during the calibration or adjustment of PMUs or SAMUs. The accuracy of these instruments depends on their ability to measure the absolute phase. The principle of the method is based on a phase comparison between a sine wave and the fundamental component of a square wave of identical frequency. The absolute phase angle of the square wave is first established against the PPS signal of an atomic clock.
关键词： Pulse Per Second (PPS),low pass filter,Global Positioning System (GPS),Absolute phase measurement,Phasor Measurement Unit (PMU),Coordinated Universal Time (UTC),Stand Alone Merging Unit (SAMU)
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Influence of Atomic Clock's Frequency Correction to UTC(IMBH) Time Scale Stability
摘要： The aim of steering national time scale of Bosnia and Herzegovina UTC(IMBH) is to keep it accurate and stable. Steering of UTC(IMBH) is realized by applying frequency corrections into atomic clock 5071A on the daily basis. Consequences of frequency correction value to short and long term time scale stability are evaluated. The intention of this work is to find optimal solution between applied relative frequency correction and time scale stability.
关键词： time scale steering,atomic clock,time stability,UTC
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - A PMU Calibration System
摘要： There is a need for traceable calibrations of Phasor measurement units, which measures the phase angle of power system signals with respect to the universal time. This paper describes the design of such a calibration system. The system utilizes a fast A-D converter, synchronized to the Swedish time and frequency realization. The speed and synchronization makes the calibration and adjustment fast and relatively straight-forward. Coaxial dividers and shunts are used for system control. The goal is a three-phase system with an angular uncertainty in the order of, or better than ±0.002° or ±100 ns.
关键词： calibration,traceability,UTC,Measurement,phasor measurement standards,phase angle
更新于2025-09-10 09:29:36
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Design of Bias-Free Operational Uni-traveling-Carrier Photodiodes by Transient Simulation for High-power Pulsed Millimeter-Wave Signal Generation in the Sub-THz Regime
摘要： In this paper, bias-free operational uni-traveling-carrier photodiodes (UTC-PDs) for high-power pulsed millimeter-wave signal generation in the sub-terahertz regime are designed and investigated. The reliability of the physics-based transient simulation is first demonstrated by comparing with reported experimental results. Then, the epitaxial layers are analyzed and optimized through transient simulation for bias-free operation and high-power pulsed millimeter-wave signal generation. The performance between original and optimal structure is compared under excitation of pulse train and sinusoidal optical signals. The results show that the peak output power of the modified UTC-PD under 100-GHz, 200-GHz, and 312.5-GHz pulse train excitation is 4.685 dBm, 1.128 dBm, and ? 4.653 dBm, improved by 2.05 dB, 5.15 dB, and 9.36 dB, respectively.
关键词： Bias-free,Optical communication,Millimeter-wave,Transient simulation,Terahertz communications,Sub-terahertz,Uni-traveling-carrier photodiodes (UTC-PD)
更新于2025-09-09 09:28:46