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Uni-traveling-carrier photodiodes(UTC-PDs)with ultrafast response and high saturation output are reported.A gradient doping layer and a narrow InP cliff layer were introduced to enhance the saturation and bandwidth characteristics.We measured the dark current,photo response,bandwidth,and saturation current of the fabricated UTC devices.For a15-μm-diameter device,the dark current was 3.5 nA at a reverse bias of 1 V,and the 3-dB bandwidth was 17.2 GHz at a reverse bias of 5 V,which are comparable to the theoretically values.The maximum responsivity at 1.55μm was 0.32 A/W.The saturation output current was over 19.0 mA without bias. 相似文献
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利用载流子漂移-扩散模型, 模拟并分析了InGaAs/InP单载流子光电探测器(Uni-traveling-carrier/UTC-PD) 在不同条件下的物理特性及其带宽和饱和特性, 结合器件实验结果分析了影响器件高速和高饱和性能的物理机理. 结论表明在吸收区采用浓度渐变掺杂和增加InP崖层(cliff layer), 可以显著提升器件饱和特性, 高入射功率下吸收区电场崩塌是器件饱和的直接因素, 直径大于20 μm的UTC探测器中RC常数仍是影响带宽的主要因素. 论文指出了优化器件结构、 提升器件性能的有效方法. 相似文献
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Monolithic optical gates based on integration of evanescently-coupled uni-traveling-carrier photodiodes and electroabsorption modulators 下载免费PDF全文
We report on chip-scale optical gates based on the integration of evanescent waveguide unitraveling-carrier photodiodes (EC-UTC-PDs) and intra-step quantum well electroabsorption modulators (IQW-EAMs) on n-InP substrates.These devices exhibit simultaneously 2.1 GHz and 16.2 dB RF-gain at 21 GHz with a 450 thin-film resistor and a bypass capacitor integrated on a chip. 相似文献
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A new evanescently-coupled uni-traveling-carrier photodiode (EC-UTC
PD) based on a multimode diluted waveguide (MDW) structure is
fabricated, analysed and characterized. Optical and electrical
characteristics of the device are investigated. The excellent
characteristics are demonstrated such as a responsivity of 0.36~A/W,
a bandwidth of 11.5~GHz and a small-signal 1-dB compression current
greater than 18~mA at 10~GHz. The saturation current is
significantly improved compared with those of similar
evanescently-coupled pin photodiodes. The radio frequency (RF)
bandwidth can be further improved by eliminating RF losses induced
by the cables, the probe and the bias tee between the photodiode and
the spectrum analyzer. 相似文献
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