A silicon nitride waveguide chip with multimode Euler bends is proposed and fabricated for integrated optical gyroscope applications. The 1.01-m waveguide achieves 4.8-dB/m attenuation over $\mathbf{4300} \times \math...
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ISBN:
(数字)9798350379266
ISBN:
(纸本)9798350379273
A silicon nitride waveguide chip with multimode Euler bends is proposed and fabricated for integrated optical gyroscope applications. The 1.01-m waveguide achieves 4.8-dB/m attenuation over $\mathbf{4300} \times \mathbf{1730}\ \boldsymbol{\mu} \mathbf{m}^{\mathbf{2}}$ footprint, supporting 0.58 deg/s minimum detectable angular rate.
The reliable operation of the distribution network is intricately linked to the overall stability of the power system. However, existing methodologies often fall short in precisely identifying the fault location withi...
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ISBN:
(数字)9798350383317
ISBN:
(纸本)9798350383324
The reliable operation of the distribution network is intricately linked to the overall stability of the power system. However, existing methodologies often fall short in precisely identifying the fault location within the electricity distribution network and providing timely warnings prior to the occurrence of faults. The development of electromagnetic sensing theory and artificial intelligence algorithms has provided a new method for the monitoring of distribution networks. To address the inverse problem, this work investigates the field distribution around the distribution network, analyzes the characteristics of the power frequency electromagnetic field and partial discharge field. Furthermore, it conducts an analysis of the feasibility of using electromagnetic sensing theory to monitor the operational status of the distribution network.
We demonstrate a dual-wavelength optical frequency standard based on the dual-optical-transition modulation transfer spectroscopy(DOT-MTS)between different quantum transitions of the rubidium D1(795 nm)and D2(780 nm)*...
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We demonstrate a dual-wavelength optical frequency standard based on the dual-optical-transition modulation transfer spectroscopy(DOT-MTS)between different quantum transitions of the rubidium D1(795 nm)and D2(780 nm)*** a single rubidium atomic ensemble,modulation frequency sidebands from the 780 nm pump beam are simultaneously transferred to both the 780 and 795 nm probe *** DOT-MTS enables the simultaneous stabilization of 780 and 795 nm lasers on a single vapor *** lasers exhibit a frequency instability in the low 10-14range at 1 s of averaging,as estimated from the residual error signal.A theoretical model is developed based on the V-type atomic level structure to illustrate the dual-wavelength *** approach can be extended to develop a multi-wavelength optical frequency standard within a single atomic ensemble,broadening its applicability in fields such as precision metrology,Rydberg atoms,wavelength standards,opticalnetworks,and beyond.
A frequency-modulated continuous-wave Lidar chip with integrated transceiver array and lens-assisted beam steering is demonstrated. It enables beam emitting, steering and receiving on a single Lidar chip with simultan...
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Without any specialized receivers for extracting phase noise, we demonstrate a distributed acoustic sensor with phase noise compensation. 50 km sensing range is achieved using 100 kHz linewidth laser in EDFA free expe...
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ISBN:
(数字)9798350379266
ISBN:
(纸本)9798350379273
Without any specialized receivers for extracting phase noise, we demonstrate a distributed acoustic sensor with phase noise compensation. 50 km sensing range is achieved using 100 kHz linewidth laser in EDFA free experimental scheme.
Missing data affects stability analysis of Radio Frequency (RF) transfer system. In this paper, a missing data prediction method using Long Short-Term Memory (LSTM) network is proposed for the short-term failure in RF...
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We propose a scanning-free BOTDA system with single-end access by employing the Rayleigh backscattering lightwave of a linear frequency modulated optical pulse as the probe wave to simplify the system and increase the...
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An integrated frequency-modulated continuous-wave Lidar is demonstrated based on lens-assisted beam steering technology at 1550nm. For the first time, the integrated Lidar has achieved a maximum ranging distance up to...
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Er doped Si light-emitting diodes may find important applications in silicon photonics and optical quantum computing. These diodes exhibit an emission efficiency 2 orders of magnitude higher at reverse bias than forwa...
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Er doped Si light-emitting diodes may find important applications in silicon photonics and optical quantum computing. These diodes exhibit an emission efficiency 2 orders of magnitude higher at reverse bias than forward bias due to impact excitation. However, physics of impact excitation in these devices remains largely unexplored. In this work, we fabricated an Er/O/B codoped Si light-emitting diode which exhibits a strong electroluminescence by the impact excitation of electrons inelastically colliding the Er ions. An analytical impact-excitation theory was established to predict the electroluminescence intensity and internal quantum efficiency which fit well with the experimental data. From the fittings, we find that the excitable Er ions reach a record concentration of 1.8×1019 cm−3 and up to 45% of them is in an excitation state by impact excitation. This work has important implications for developing efficient classical and quantum light sources based on rare earth elements in semiconductors.
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