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Analysis of the injection-locked magnetron with a mismatched circulator
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作者 岳松 张兆传 高冬平 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第8期616-621,共6页
Based on the scatter matrix of the four-port lossless mismatched circulator, the phase differential equation of the injection-locked magnetron is derived by comparing different effects of the mismatched and perfect ci... Based on the scatter matrix of the four-port lossless mismatched circulator, the phase differential equation of the injection-locked magnetron is derived by comparing different effects of the mismatched and perfect circulator on the injection ratio. Besides, the locking range of the injection-locked magnetron with the mismatched circulator is deduced by functional operation. In addition, the phase differential equation and the locked bandwidth of the injection-locked system with a mismatched circulator are compared with those of the small injection-ratio case with a perfect circulator. The in- fluence of the circulator reflection coefficient on the injection-locked magnetron is also analyzed by numerical calculation. Theoretical analysis shows that the decrement of the locked bandwidth is less than 1% and decrement of the stable phase difference is less than 1.2% when the reflection coefficient is less than 0.1. 展开更多
关键词 injection-locked magnetron mismatched circulator phase difference locked bandwidth
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Theoretical investigation of frequency characteristics of free oscillation and injection-locked magnetrons
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作者 岳松 高冬平 +1 位作者 张兆传 王韦龙 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第11期632-639,共8页
The frequency characteristics of free oscillation magnetron(FOM) and injection-locked magnetron(ILM) are theoretically investigated.By using the equal power voltage obtained from the experiment data,expressions of... The frequency characteristics of free oscillation magnetron(FOM) and injection-locked magnetron(ILM) are theoretically investigated.By using the equal power voltage obtained from the experiment data,expressions of the frequency and radio frequency(RF) voltage of FOM and ILM,as well as the locking bandwidth,on the anode voltage and magnetic field are derived.With the increase of the anode voltage and the decrease of the magnetic field,the power and its growth rate increase,while the frequency increases and its growth rate decreases.The theoretical frequency and power of FOM agree with the particle-in-cell(PIC) simulation results.Besides,the theoretical trends of the power and frequency with the anode voltage and magnetic field are consistent with the experimental results,which verifies the accuracy of the theory.The theory provides a novel calculation method of frequency characteristics.It can approximately analyze the power and frequency of both FOM and ILM,which promotes the industrial applications of magnetron and microwave energy. 展开更多
关键词 magnetron locked anode microwave bandwidth conductance oscillation preferred locking decreasing
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Design of low-noise photodetector with a bandwidth of130 MHz based on transimpedance amplification circuit 被引量:5
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作者 秦际良 闫智辉 +2 位作者 霍美如 贾晓军 彭堃墀 《Chinese Optics Letters》 SCIE EI CAS CSCD 2016年第12期122-126,共5页
A low-noise photodetector is a basic tool for the research of quantum information processing. We present a specially designed low-noise photoelectric detector with a bandwidth of 130 MHz, using a transimpedance amplif... A low-noise photodetector is a basic tool for the research of quantum information processing. We present a specially designed low-noise photoelectric detector with a bandwidth of 130 MHz, using a transimpedance amplification circuit. Based on the detailed calculation of the dependence on each parameter of the detector,a useful method of how to design a low-noise and broadband photodetector is provided. When the optical power is between 1.0 and 16 m W, the photodetector has a good linear response to the injected light. Its electronics noise power is below-77 d Bm, which is within the whole bandwidth. When the incident light power is 2 m W, the output noise powers are 10.0, 8.0, and 6.0 d B higher than the corresponding electronics noise within the bandwidth of 1–50, 50–90, and 90–130 MHz, respectively, which is in good agreement with the theoretical prediction.Thus, this photoelectric detector could have good application prospects in quantum communication and an optical cavity locking system. 展开更多
关键词 photodetector bandwidth electronics locking photoelectric amplifier amplification junction specially operational
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Revisiting the laser frequency locking method using acousto-optic frequency modulation transfer spectroscopy 被引量:1
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作者 罗玉昆 颜树华 +4 位作者 贾爱爱 魏春华 厉泽环 王恩龙 杨俊 《Chinese Optics Letters》 SCIE EI CAS CSCD 2016年第12期75-79,共5页
We present a laser frequency locking system based on acousto-optic modulation transfer spectroscopy(AOMTS). Theoretical and experimental investigations are carried out to optimize the locking performance mainly from... We present a laser frequency locking system based on acousto-optic modulation transfer spectroscopy(AOMTS). Theoretical and experimental investigations are carried out to optimize the locking performance mainly from the view of the modulation frequency and index for the specific scheme of AOMTS. An FWHM linewidth of 63 kHz is achieved and the frequency stability in terms of Allan standard deviation reaches1.4 × 10^(-12) at 30 s. The frequency shifting capacity is validated throughout the acousto-optic modulator bandwidth while the laser is kept locked. This work offers a different but efficient choice for applications calling for both stabilized and tunable laser frequencies. 展开更多
关键词 locking optic deviation modulator Allan tunable locked FWHM calling bandwidth
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A simplified tunable frequency interval optical frequency comb generator using a single continuous-wave laser
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作者 刘丽 徐铁峰 +2 位作者 戴振祥 戴世勋 刘太君 《Optoelectronics Letters》 EI 2017年第2期104-107,共4页
We propose and demonstrate a simplified and tunable frequency interval optical frequency comb(OFC) generator based on a dual-drive Mach-Zehnder modulator(DD-MZM) using a single continuous-wave(CW) laser and low-power ... We propose and demonstrate a simplified and tunable frequency interval optical frequency comb(OFC) generator based on a dual-drive Mach-Zehnder modulator(DD-MZM) using a single continuous-wave(CW) laser and low-power radio frequency(RF) driven signal. A mathematical model for the scheme is established. The 21-and 29-mode OFCs with frequency interval ranging from 6 GHz to 40 GHz are obtained under DD-MZM driven by a low-power RF signal within a maximum bandwidth of 1.12 THz. The generated OFCs exhibit spectral flatnesses of less than 0.5 d B and 0.8 d B within bandwidths of 160 GHz and 400 GHz, respectively. 展开更多
关键词 tunable simplified generator modulator flatness bandwidth resonator cascade utilize locked
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