共查询到20条相似文献,搜索用时 400 毫秒
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建立了基于注入式PIN结构的亚微米硅基波导光学相位调制器模型,对该调制器模型的光学特性和电学特性进行了理论分析和仿真,确定了器件的单偏振单模条件。在此条件下,重点分析并讨论了在不同结构参数与掺杂条件下器件调制效率的变化特性。结果表明,通过减小外脊高、增大掺杂浓度、减小波导区到掺杂区的距离、增大掺杂深度等均可有效提高器件的调制效率。在此基础上确定了器件的最优结构参数,结果表明其相位调制效率可达到19rad·V-1·mm-1,3dB带宽大于1GHz,同时该调制器还具有结构紧凑、工作电压低、易于集成的优点。 相似文献
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基于空间频谱,对光谱色散匀滑(SSD)技术与衍射光学器件(DOE)联用的焦面光强分布进行了严格的理论分析。与光谱色散匀滑技术联用前后,衍射光学器件焦面光强分布均可转化为一系列不同频率、不同复振幅的正余弦函数的叠加。光谱色散匀滑技术对衍射光学器件焦面光强分布空间频谱进行调制,该调制不仅与光谱色散匀滑参数,还与衍射光学器件相位分布有关。该技术使得衍射光学器件焦面光强分布变得更平缓,但要获得良好的联用性能,需根据光谱色散匀滑参数进行衍射光学器件的优化设计。在某一给定的光谱色散匀滑参数条件下,进行了衍射光学器件的优化设计。结果表明,与光谱色散匀滑技术联用后,衍射光学器件对入射波前畸变的宽容度有较大提高。 相似文献
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An optical code generating device has been developed based on a 1×2 asymmetric plastic optical fiber(POF) coupler.The code generating device provides a unique series of output power which are successively used as an optical code in a portable optical access-card system.The device utilizing a tap-off ratio(TOFR) technique based on a simple variation of the tap width of an asymmetric Y-branch splitter,allows various ratios of optical power to be generated.The POF coupler has been fabricated using low cost acr... 相似文献
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基于模拟退火的软X射线多层膜反射镜设计 总被引:1,自引:1,他引:0
基于模拟退火(SA)算法,对软x射线短波段中的几个波长的多层膜反射镜进行了优化设计,获得了它们的光学参数,包括多层膜反射镜的最佳周期厚度、最佳厚度比和峰值反射率,进而制作多层膜反射镜并在北京同步辐射装置上进行了反射率的实际测量。测量结果表明,该反射镜具有实用的反射率。这表明,SA方法适用于软x射线短波段多层膜反射镜的优化设计。 相似文献
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Broad area travelling wave GaAlAs SQW optical amplifiers have been fabricated and characterised. Using a 600 mu m wide and 1000 mu m long double pass amplifier, 12 W of peak pulsed output power was achieved with a 0.08 degrees wide diffraction limited far-field lobe. Small signal gain of 31 dB was measured in 400 mu m wide active area device.<> 相似文献
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研制了一款X波段增强型AlGaN/GaN高电子迁移率晶体管(HEMT)。在3英寸(1英寸=2.54 cm)蓝宝石衬底上采用低损伤栅凹槽刻蚀技术制备了栅长为0.3μm的增强型AlGaN/GaN HEMT。所制备的增强型器件的阈值电压为0.42 V,最大跨导为401 mS/mm,导通电阻为2.7Ω·mm。器件的电流增益截止频率和最高振荡频率分别为36.1和65.2 GHz。在10 GHz下进行微波测试,增强型AlGaN/GaN HEMT的最大输出功率密度达到5.76 W/mm,最大功率附加效率为49.1%。在同一材料上制备的耗尽型器件最大输出功率密度和最大功率附加效率分别为6.16 W/mm和50.2%。增强型器件的射频特性可与在同一晶圆上制备的耗尽型器件相比拟。 相似文献
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《Electron Device Letters, IEEE》1982,3(1):13-15
This paper reports radiation effects of submicron NMOS devices fabricated by e-beam lithography. This study was initiated because e-beam lithography creates neutral traps in the gate oxides of MOS devices, which may make these devices more sensitive to radiation. Indeed, we have found that for radiation doses above 10 Krad, the threshold shift for an e-beam fabricated device is twice that for the corresponding device made by optical lithography. However, with the submicron process used here the threshold shift for both types of device is quite low (<100mV below 10 Krad), Moreover, there was no correlation observed between radiation sensitivity and device gate length. 相似文献
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基于ZnO-CuO纳米线结构的新型光电器件 总被引:1,自引:1,他引:0
为了获得高效的整流器件和微型短波长的发光器 件,采用原子层沉积(ALD)法和水浴法合成了具有 ZnO-CuO的结构器件。对制备的样品进行了光学和电学特性的检测,获得了22.79的整流比和17.69的理想 因子,且门限电压和整流比等特性随CuO厚度增加而减小。在光致发光(PL)特性上,具有 显著的由ZnO带电激发的385nm紫外光波峰,同时伴有由深能级散射 激发的572nm的可见光波峰,且随着CuO厚度的增加紫外光波峰减小 ,可见光峰变大。实验结果表明,本文制备的器件可以应用在纳米型二极管、光电探测器以 及微型光源等领域。 相似文献
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《Electron Device Letters, IEEE》1987,8(2):64-65
An amorphous Si/SiC heterojunction color-sensitive phototransistor was successfully fabricated by plasma-enhanced chemical vapor deposition. The structure is glass/ITO/a-Si(n+-i)/a-SiC(p+-i-n+)/Al. The device is a bulk barrier transistor with wide-bandgap amorphous SiC emitter and base. The phototransistor revealed a very high optical gain of 40 and a response speed of 10 µs at an input light power of 5 µW and a collector current of 0.12 mA at a voltage of 14 V. The peak response occurs at 610 nm under 1-V bias and changes to 420 and 540 nm under 7- and 13-V biases, respectively. 相似文献
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K.-Y. Liou B. Glance U. Koren E.C. Burrows G. Raybon C.A. Burrus K. Dreyer 《Photonics Technology Letters, IEEE》1996,8(6):800-802
We have fabricated a monolithically integrated LED-amplifier chip for application as a high-power broad-band transmitter. Amplified LED output of 10 mW and fiber-coupled power of 4 mW was demonstrated. The device can be used as a spectrally-sliced transmitter for wavelength-division-multiplexed networks or as a broad-band transmitter in subcarrier multiple-access systems to eliminate optical beat interference. The amplifier section in the integrated device can also be used as a photodetector. The performance of the device as a transceiver in a WDM multiple-access system operating at a typically proposed local-access data rate of 10 Mb/s was successfully demonstrated. 相似文献
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Characterization of a full encoder/decoder in the AWG configuration for code-based photonic Routers-part II: experiments and applications 总被引:1,自引:0,他引:1
Naoya Wada Cincotti G. Yoshima S. Kataoka N. Kitayama K. 《Lightwave Technology, Journal of》2006,24(1):113-121
A 200-gigachip/s multiple encoder/decoder in an arrayed waveguide configuration, which generates and recognizes simultaneously 16 optical labels in parallel, has been fabricated. The device has been experimentally characterized, and a 10-Gb/s 50-km optical packet switching (OPS) experiment has been successfully performed: Optical packets are switched to their own destinations using a single device with a processing rate of 13 gigapackets/s. 相似文献