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1.
《Lightwave Technology, Journal of》2009,27(16):3410-3415
2.
The design and characterisation of a millimetre-wave uni-travelling-carrier photodiode with a monolithically integrated matching (impedance transform) circuit utilising a coplanar-waveguide short-stub are presented. The device with the matching circuit shows ~50% higher efficiency than one with a 50 Ω load design. The maximum saturation output power obtained is 13.6 mW at 100 GHz 相似文献
3.
Chan K.T. Chin A. Lin Y.D. Chang C.Y. Zhu C.X. Li M.F. Kwong D.L. McAlister S. Duh D.S. Lin W.J. 《Microwave and Wireless Components Letters, IEEE》2003,13(11):487-489
We have improved the performance of integrated antennas on Si for possible application in wireless communications and wireless interconnects. For practical VLSI integration, we have reduced the antenna size and optimized the proton implantation to a low energy of /spl sim/4 MeV with a depth of /spl sim/175 /spl mu/m. To avoid any possible contamination, the ion implantation is applied after device fabrication. Excellent performance such as very low RF power loss up to 50 GHz, record high 103 GHz antenna resonance, and sharp 5 GHz bandwidth have been achieved. 相似文献
4.
在时域和视域测量仪器中,取样技术一直起着重要的信号捕获和变换作用,例如数字示波器的实时带宽远远不如取样示波器的等效带宽. 相似文献
5.
Shin'ichiro Asayama Hideo Ogawa Takashi Noguchi Kazuji Suzuki Hiroya Andoh Akira Mizuno 《Journal of Infrared, Millimeter and Terahertz Waves》2004,25(1):107-117
We have developed an integrated sideband-separating SIS mixer for the 100 GHz band based on the waveguide split block. The measured receiver noise temperatures with 4.0–8.0 GHz IF are less than 60 K in the LO frequency range of 90–110 GHz, and a minimum value of around 45 K is achieved at 100 GHz. The image rejection ratios are more than 10 dB in the frequency range of 90–110 GHz. We have installed the sideband-separating SIS mixer into an atmospheric ozone-measuring system at Osaka Prefecture University and successfully observed an ozone spectrum at 110 GHz in SSB mode. This experimental result indicates that the sideband-separating SIS mixer is very useful for astronomical observation as well as atmospheric observation. 相似文献
6.
《IEE Review》1999,45(2):69-71
Escalating transmission rates in telecoms networks are the spur behind an international research effort in optical processing. The author reports on the work of the BT researchers who are laying the foundations for a new era of photon-based switching systems. The work is based on an interferometric switch known as the TOAD. The TOAD is a variant of a Mach-Zehnder interferometer. Light enters the interferometer, then passes through a 50:50 coupler which divides the input equally between the upper and lower arms. In general, the upper and lower light streams will experience different phase shifts, and these shifts will determine the way the original input is allocated between the two output ports. In particular, if the interferometer is suitably biased then all the light will appear at one or other of the outputs. Now, if a phase shift is introduced into one of the arms the output will switch between ports. This is the principle; its practical exploitation depends on the availability of a device that can effect a π phase shift at a rate of at least tens of GHz. In the TOAD this function is assigned to a semiconductor optical amplifier 相似文献
7.
Dutta A.K. Kosaka H. Kurihara K. Sugimasa Y. Kasahara K. 《Lightwave Technology, Journal of》1998,16(5):870-875
High-speed vertical cavity surface emitting laser (VCSEL) with 6×6 μm active area is fabricated by reducing its pad area in order to reduce its parasitic capacitance. The fabricated VCSEL shows the 3 dB bandwidth of over 7 GHz and average threshold current of 0.7 mA. This is the highest 3 dB modulation bandwidth ever reported for the plan type bottom emitted laser with pad. The maximum intrinsic bandwidth as estimated from k-factor is found to be over 20 GHz, which is less than three times than the observed bandwidth. The thermal characteristics are also found to be almost unchanged due to the reducing of its pad size. It also showed open eye pattern for 3 GHz nonreturn to zero (NRZ) pseudorandom signal after transmission through 100 m large core plastic clad fiber (PCF), which could be used in short and medium distance optical links 相似文献
8.
The leakage current I
p
over the surface of CdxHg1−x
Te-based photodiodes that have a cutoff wavelength of the photosensitivity spectrum of λ=9.8–11.6 μm and are fabricated by
implanting Zn++ ions into the p-type solid solution is investigated. The surface character of the I
p
current is indicated by a coordinate shift of the peak in the sensitivity profile of n
+-p junctions, which is measured in a scanning mode by the beam of a CO2 laser with a wavelength of 10.6 μm, with an increase in voltage U across the photodiode and the shift of spectral characteristics to shorter wavelengths with increasing U.
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Translated from Fizika i Tekhnika Poluprovodnikov, Vol. 38, No. 7, 2004, pp. 890–895.
Original Russian Text Copyright ? 2004 by Biryulin, Turinov, Yakimov. 相似文献
9.
The design and performance of a rugged duroid-microstrip IMPATT-diode oscillator is described. The oscillator's frequency was set by a simple, easily replaceable metal resonant cap, with fine tuning of about 30 MHz/mA being achieved by means of the diode current. 相似文献
10.
《Electron Devices, IEEE Transactions on》1973,20(9):765-771
This paper reports the highestx power (frequency)2IMPATTS produced to date. A CW output power of 380 mW has been achieved at 92 GHz with an efficiency of 12.5 percent. An all-implanted double-drift n+-n-p-p+silicon structure was fabricated, using a lightly doped epitaxial layer as the starting material. The newly made structure uses a more shallow n+contact than previous diodes, and therefore has more equal drift spaces. Small-signal admittance calculations show lower susceptance per unit area in the newly made structure. The shallow contact has allowed the study of unequal dopings in the n- and p-drift spaces. Unequal dopings up to 50 percent can be tolerated with less than 20 percent variation in measured efficiency and output power. Both admittance and breakdown voltage calculations based upon experimentally determined doping profiles and independently measured ionization coefficients were found to be in good agreement with experiment. The doping profiles on both sides of the depletion region were determined byC(V) analysis. The testing of both the old and new structures has been carried out in a microwave circuit having improved mechanical tuning accuracy due to the introduction of a newly designed tuning plunger. 相似文献
11.
Sections of groove guide can be simply connected together with a loss of less than 0.2 dB even at 100 GHz. A gap of up to 1 mm between the sections introduced an additional loss of only about 0.1 dB and alignment tolerances needed to be no better than ±0.5 mm. 相似文献
12.
Bo Zhang Ge Liu Zhe Chen Xiao-Fan Yang Ning-Bo Chen San-Tong Wu Yong Fan 《电子科技学刊:英文版》2013,11(4):349-351
This paper presents the design and simulation of several fixed-tuned sub-harmonic mixers cover frequencies from 110 GH to 130 GHz, 215 GH to 235 GHz, 310 GH to 350 GHz, and 400 GH to 440 GHz. Among them, 120 GHz, 225 GHz, 330 GHz subharmonic mixers are designed with flip-chipped planar schottky diode mounted onto a suspended quartz-based substrate, the 225 GHz and 425 GHz subharmonic mixers are GaAs membrane integrated, and the 115 GHz subharmonic mixer has been fabricated and tested already. 相似文献
13.
利用准相位匹配技术和Sagnac环结构设计研制了一套高亮度、高稳定性、小型化、可移动式的一体化纠缠源系统.此纠缠源基于周期极化磷酸钛氧钾(PPKTP)晶体参量下转换过程,亮度达到了13.8 Mcps,偏振对比度好于98%,纠缠度达到0.9 357,温度变化和机械振动测试引起的计数率抖动小于5%.此系统成功地应用到了外场百公里量子纠缠分发和连续长时间关联速度下限测量试验中,从而为进一步实现空间纠缠源载荷提供了良好的试验技术基础. 相似文献
14.
15.
Stohr A. Heinzelmann R. Hagedorn K. Gusten R. Schafer F. Stuer H. Siebe F. van der Wal P. Krozer V. Feiginov M. Jager D. 《Electronics letters》2001,37(22):1347-1348
A photonic sub-millimetre (sub-mm) wave transmitter module has been developed and fabricated. The module consists of a 1.55 μm waveguide InP photodetector monolithically integrated with a planar full wave slot antenna and passive lowpass filter for DC bias supply. For the first time, optical heterodyne 460 GHz sub-mm signal generation is demonstrated It is further shown that the module can effectively replace the classical solid-state oscillator of an astronomical superconductor-insulator-superconductor heterodyne receiver The module generates sufficient sub-mm wave power to operate the receiver under optimum conditions 相似文献
16.
《III》1998,11(2):34-38
The primary research field of Fraunhofer-Institut Angewandte Festkörperphysik (IAF)(Applied Solid-State Physics) in Freiburg, Germany, is III–V electronics, with a focus on high-speed/high-frequency devices and integrated circuits for various applications in commercial and military systems. William Haydl, head of the MMIC group, reports on IAF's latest developments. 相似文献
17.
A detector has been designed and constructed, using a beam-lead diode, directly in a groove guide. A triangular dipole, produced by photolithography on RT/Duroid 5880, is placed transversely across the guide. A GEC beam-lead Schottky diode, bonded across the dipole, acts as the rectifying element. When used with a cylindrical back short-circuit and an appropriate bias current, a voltage sensitivity of about 400 VW?1 and a tangential sensitivity of about ?42 dBm was obtained at a frequency of 100 GHz. 相似文献
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19.
C.C. Chin D. Derdall J. Sebesta F. Jiang P. Dindo G. Rodrigues D. Bond S.-K. Pan A. R. Kerr E. Lauria M. Pospieszalski J. Zhang T. Cecil A. Lichtenberger 《Journal of Infrared, Millimeter and Terahertz Waves》2004,25(4):569-600
We have built a 100 GHz sideband-separating receiver. The receiver, a breadboard for the band 3 cartridges for ALMA, achieves a SSB noise temperature of 6hf/k with a 4–8 GHz IF. We show that it is possible to meet the ALMA specifications. The design of the receiver is reviewed and the relationships between the receiver noise temperature and properties of the components used in the receiver are discussed. 相似文献
20.
为解决射频信号接收系统前端因强电磁干扰而发生的互调干扰、阻塞和饱和等问题,设计基于宽带匹配网络优化了一款高效率宽带接收机。该接收机模块工作频率覆盖整个S波段,其采用4线制SPI接口,根据上位机的指令完成链路控制。除此之外,采用7阶巴特沃斯低通滤波器设计,严格保证带内最佳平坦度和端口驻波比。实测结果表明,该接收机模块实现了100 kHz~6 GHz的信号放大和下变频,并以140 MHz和100 kHz~19.999 MHz的中频输出,具备内外部10 MHz参考时基自动切换功能。可见射频接收前端优化设计可实现对目标侦测频段内信号的高选择性跟踪预选,使接收系统对强干扰信号进行有效抑制。 相似文献