Journals >Optoelectronics Letters
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2021
Volume: 17 Issue 12
11 Article(s)
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Deep learning enables temperature-robust spectrometer with high resolution
Jiaan GAN, Mengyan SHEN, Xin XIAO, Jinpeng NONG, and Fu FENG
Traditional multi-mode fiber spectrometers rely on algorithms to reconstruct the transmission matrix of the fiber, facing the challenge that the same wavelength can lead to many totally de-correlated speckle patterns as the transfer matrix changes rapidly with environment fluctuations (typically temperature fluctuationTraditional multi-mode fiber spectrometers rely on algorithms to reconstruct the transmission matrix of the fiber, facing the challenge that the same wavelength can lead to many totally de-correlated speckle patterns as the transfer matrix changes rapidly with environment fluctuations (typically temperature fluctuation). In this manuscript, we theoretically propose a multi-mode-fiber (MMF) based, artificial intelligence assisted spectrometer which is ultra-robust to temperature fluctuation. It has been demonstrated that the proposed spectrometer can reach a resolution of 0.1 pm and automatically reject the noise introduced by temperature fluctuation. The system is ultra-robust and with ultra-high spectral resolution which is beneficial for real life applications..
Optoelectronics Letters
- Publication Date: Jan. 10, 2022
- Vol. 17, Issue 12, 705 (2021)
A tunnel lighting control system based on human vision and variable reduction coefficient
Mohan LIU, and Hong LIU
Due to the changeable brightness outside the tunnel, the lighting brightness at the exit and entrance of the tunnel needs to be adjusted in time, so as to ensure that the driver can feel the difference of light intensity within the range that the human eye can adapt to when passing through the tunnel. In this paper, a Due to the changeable brightness outside the tunnel, the lighting brightness at the exit and entrance of the tunnel needs to be adjusted in time, so as to ensure that the driver can feel the difference of light intensity within the range that the human eye can adapt to when passing through the tunnel. In this paper, a tunnel lighting control strategy based on variable reduction factor is proposed, which can ensure that the lighting around the tunnel is within the range that the human eye can adapt to at any time. Through the field data collection and comparison and experiments, it can be shown that the lighting control method not only can improve the lighting quality in the tunnel, but also have better energy- saving effect and can reduce the cost of manual operation and maintenance..
Optoelectronics Letters
- Publication Date: Jan. 10, 2022
- Vol. 17, Issue 12, 710 (2021)
Independently tunable Fano resoances based on E-shaped cavity and its high performance sensing application
Guodong WEI, and Xiao WANG
A novel nanostructure based on a simple metal-dielectric-metal (MDM) bus waveguide with sliver baffle as well as an E-shaped cavity is proposed to generate double Fano resonances arising from interference between broad continuous state and narrow discrete state. The commercial software COMSOL based on finite element meA novel nanostructure based on a simple metal-dielectric-metal (MDM) bus waveguide with sliver baffle as well as an E-shaped cavity is proposed to generate double Fano resonances arising from interference between broad continuous state and narrow discrete state. The commercial software COMSOL based on finite element methods is used to explore the Fano resonances properties and the senor properties of the system. According to the simulation results, it is demonstrated that E-shaped cavity can generate two discrete states, and the continuous sate is constructed by loading sliver baffle in bus waveguide. Moreover, it can be found that the Fano peak wavelengths and profiles can easily be tuned via structural parameters. Interestingly, the independent control of the left Fano resonance (LFR) can be accomplished by changing horizontal cavity length of E-shaped cavity. Meanwhile, our proposed nanostructure has a higher sensitivity of 1 440 nm/RIU as well as a higher figure of merit (FOM) value approximately 5 244. In conclusion, the proposed independently tunable Fano nanostructure may have a great promising in the fields of nanosensors, filters and other optical devices..
Optoelectronics Letters
- Publication Date: Jan. 10, 2022
- Vol. 17, Issue 12, 717 (2021)
Sagnac fiber interferometer with the population grating for fiber Bragg grating dynamic strain sensing
Wei WANG, Chuanyi TAO, Hao WANG, Xuhai JIANG... and Zidi GU|Show fewer author(s)
A Sagnac fiber interferometer with the population grating formed in saturable erbium-doped fiber (EDF) for fiber Bragg grating (FBG) dynamic strain sensing is proposed. In this configuration, a semiconductor optical amplifier (SOA)-based fiber ring laser with an FBG reflector is employed in the sensing part and a SagnaA Sagnac fiber interferometer with the population grating formed in saturable erbium-doped fiber (EDF) for fiber Bragg grating (FBG) dynamic strain sensing is proposed. In this configuration, a semiconductor optical amplifier (SOA)-based fiber ring laser with an FBG reflector is employed in the sensing part and a Sagnac interferometer based on transient two-wave mixing (TWM) via dynamic population gratings in single-mode polarization maintaining erbium- doped fiber (PM-EDF) is used in this detecting part. Experimental results show that the Sagnac fiber interferometer detection system can stably respond to dynamic strains at high frequencies. As an example of application, the response of the sensor system to continuous sinusoidal ultrasonic signals is presented. The proposed simple and robust configuration has an all-fiber design based on commercially available elements, which makes it promising for applications in fiber optic ultrasonic sensors..
Optoelectronics Letters
- Publication Date: Jan. 10, 2022
- Vol. 17, Issue 12, 723 (2021)
Multi-pulse operation in an actively Q-switched Er-doped fiber laser based on electro-optic modulator
Ailing ZHANG, Chang LIU, Honggang PAN, and Shuying GUO
In this paper, we report an experimental observation of different states of multi-pulse operation in an actively Q-switched Er-doped fiber laser, which has applications in pulse coding in optical communications. The Q factor is switched by an electro-optic modulator. Completely separated multiple pulses are obtained duIn this paper, we report an experimental observation of different states of multi-pulse operation in an actively Q-switched Er-doped fiber laser, which has applications in pulse coding in optical communications. The Q factor is switched by an electro-optic modulator. Completely separated multiple pulses are obtained due to the short response time of the modulator. The influence of pump power and modulation frequency on output pulse state is investigated. In the experiment, the repetition rate of Q-switched pulse is not always consistent with the modulation signal. Single- pulse, single-dual-pulse, dual-pulse, dual-triple pulse, and multiple pulses are observed in one modulation period by increasing pump power. Single-pulse is also observed in two or three modulation periods by increasing the frequency of modulation signal. In addition, the waveform of modulating signal and the polarization state of modulated signal also affect the multi-pulse operation accordingly..
Optoelectronics Letters
- Publication Date: Jan. 10, 2022
- Vol. 17, Issue 12, 729 (2021)
Simulation and analysis of polycrystalline silicon photovoltaic cells surface color differences based on transfer matrix method
Zijian CHEN, Zenghong MA, Haoyuan JIA, Lian ZHANG... and Shiyu WANG|Show fewer author(s)
Following the previous work, in this paper, the antireflective films thicknesses, refractive indexes and reflectance spectra of different color categories of the polycrystalline silicon cells are tested and compared. It is found that the color difference of polycrystalline silicon cells is mainly caused by the antireflFollowing the previous work, in this paper, the antireflective films thicknesses, refractive indexes and reflectance spectra of different color categories of the polycrystalline silicon cells are tested and compared. It is found that the color difference of polycrystalline silicon cells is mainly caused by the antireflective film. Then the matrix transfer method is used to simulate the reflection spectra according to the actual tested parameters of the samples, and the effectiveness of the simulation is verified. Finally, according to the distribution of the spectral solar irradiance, the total solar absorption of the polycrystalline silicon cells with different antireflective film thicknesses is simulated. The optimal value of the antireflective film thickness of the polycrystalline silicon cell is calculated. This study has important guiding significance for photovoltaic (PV) enterprises to realize the optimal production of plasma enhanced chemical vapor deposition (PECVD) process in production..
Optoelectronics Letters
- Publication Date: Jan. 10, 2022
- Vol. 17, Issue 12, 734 (2021)
High-speed real-time visible light communication system based on InGaN/GaN-base multi-quantum well blue micro-LED
Jia YU, Zhengjun WEI, Xiaojun GUAN, Yingfang ZHENG... and Yiqin XU|Show fewer author(s)
Visible light communication (VLC) technology is a new type of wireless communication technology, which employs a light source as the carrier of information to realize illumination and communication simultaneously. This paper adopts a single InGaN/GaN-base multi-quantum well blue micro-light emitting diode (LED) as the Visible light communication (VLC) technology is a new type of wireless communication technology, which employs a light source as the carrier of information to realize illumination and communication simultaneously. This paper adopts a single InGaN/GaN-base multi-quantum well blue micro-light emitting diode (LED) as the light source, designs pre-emphasis circuit, LED driver circuit, impedance matching network, etc., and builds a high-speed real-time VLC system. It has been verified that the LED achieves a 3 dB modulation bandwidth of 450 MHz or more; and the real-time communication rate reaches over 800 Mbit/s at a distance of 2 m. The communication bit error rate (BER) is as low as 3.02×10-12 at a communication rate of 622 Mbit/s. Experimental indicators including 3 dB bandwidth, communication rate, and communication BER are all taken into account. Therefore, this VLC system supports high-quality high-speed real-time communication..
Optoelectronics Letters
- Publication Date: Jan. 10, 2022
- Vol. 17, Issue 12, 741 (2021)
All-optical scheme for implementation of tri-state Pauli-X, Y and Z quantum gates using phase encoding
Sarfaraj Mir Nadim, and Mukhopadhyay Sourangshu
Quantum logic gates are the basic building blocks of quantum computing system. Single qubit Pauli-X, Y and Z quantum gates are very much well known in quantum computing community. In this paper, we develop tri-state Pauli-X, Y and Z quantum gates using phase encoding technique of light. This phase encoding mechanism maQuantum logic gates are the basic building blocks of quantum computing system. Single qubit Pauli-X, Y and Z quantum gates are very much well known in quantum computing community. In this paper, we develop tri-state Pauli-X, Y and Z quantum gates using phase encoding technique of light. This phase encoding mechanism makes the implementation of those gates easier even with tri-state approach. As light is used for signal representation, one can exploit the parallelism in operation..
Optoelectronics Letters
- Publication Date: Jan. 10, 2022
- Vol. 17, Issue 12, 746 (2021)
Effect of surfactant on performance of ZnO humidity sensor
Chen YANG, Weiyuan GU, Shuguo YU, and Hongyan ZHANG
In this study, using surfactant monoethanolamine (MEA), zinc oxide (ZnO)-MEA humidity sensor based on ZnO was successfully prepared by hydrothermal method. MEA makes the surface of the ZnO-MEA have more oxygen vacancy and hydrophilic functional groups, which improves the performance of ZnO humidity sensor. ZnO-MEA achiIn this study, using surfactant monoethanolamine (MEA), zinc oxide (ZnO)-MEA humidity sensor based on ZnO was successfully prepared by hydrothermal method. MEA makes the surface of the ZnO-MEA have more oxygen vacancy and hydrophilic functional groups, which improves the performance of ZnO humidity sensor. ZnO-MEA achieved a change of 4 orders of magnitude at room temperature in the relative humidity (RH) from 11% to 95%, and it shows better linearity, shorter response/recovery time (20 s/15.9 s), smaller humidity lag and long-term stability. In addition, the distribution of ZnO-MEA particles is more uniform and provides more active sites for adsorption of water molecules to enhance humidity sensing performance..
Optoelectronics Letters
- Publication Date: Jan. 10, 2022
- Vol. 17, Issue 12, 751 (2021)
Optical cavity structure design and optical path simulation for rapid nitric oxide detection
Wen LI, Yongqing CAI, Mengfan CHEN, and Peng LIU
According to the chemiluminescence reaction mechanism of nitric oxide (NO) and ozone (O3), a new cylindrical total reflection S-type optical cavity design for rapid detection of NO gas is proposed. The optical cavity model is based on the total reflection S-type structure on the inner wall of the cylinder. Optical softAccording to the chemiluminescence reaction mechanism of nitric oxide (NO) and ozone (O3), a new cylindrical total reflection S-type optical cavity design for rapid detection of NO gas is proposed. The optical cavity model is based on the total reflection S-type structure on the inner wall of the cylinder. Optical software ZEMAX was used to simulate the optical path of the model, and software FLUENT was used to simulate and verify the structure. The comparative analysis showed that the chemiluminescence collection efficiency of the S-type optical cavity collection path was 36.6%, and the gas reaction and mixing in the S-type optical cavity model was more sufficient, and the reaction mixing stability error was 0.049, which was 2 times higher than the traditional stability error. The model is simple in structure and meets the new national standards. It provides a practical idea of design for the real-time exhaust gas detection..
Optoelectronics Letters
- Publication Date: Jan. 10, 2022
- Vol. 17, Issue 12, 757 (2021)
Research on the measurement of CH4 concentration based on dual-band weighted combination model
Honglian LI, Wenduo LI, Xiangyu YAN, Heshuai Lü... and Lide FANG|Show fewer author(s)
A detection system based on supercontinuum laser absorption spectroscopy (SCLAS) technology was built up in this study. The absorption spectra of CH4 in different near-infrared bands were measured based on the SCLAS detection system. Under normal temperature and pressure, the absorption spectra of CH4 at different concA detection system based on supercontinuum laser absorption spectroscopy (SCLAS) technology was built up in this study. The absorption spectra of CH4 in different near-infrared bands were measured based on the SCLAS detection system. Under normal temperature and pressure, the absorption spectra of CH4 at different concentrations in the bands of 1 319—1 339 nm and 1 656—1 676 nm were measured. The linear models of CH4 concentrations in different bands were established. The fitting coefficient (R2) of the models were 0.995 7 and 0.996 1, respectively. In order to improve the concentration inversion ability of the model, the weight distribution of each model was determined by R2 and sum of squared error (SSE) to obtain a new combined model. The maximum relative error of the concentration inversion was reduced from 2.3% to 1.3%. The experimental results show the feasibility of applying the SCLAS technology to CH4 concentration measurement, and it also verifies that the dual-band combination model can improve the accuracy and stability of the CH4 concentration measurement..
Optoelectronics Letters
- Publication Date: Jan. 10, 2022
- Vol. 17, Issue 12, 763 (2021)
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