Generation and Propagation of Sub-Terahertz Pulse Signal Using Waveguide-Integrated InP/InGaAs Uni-Traveling-Carrier Photodiode
Generation and Propagation of Sub-Terahertz Pulse Signal Using Waveguide-Integrated InP/InGaAs Uni-Traveling-Carrier Photodiode
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使用波导集成 InP/InGaAs 单行载波光电二极管生成和传播亚太赫兹脉冲信号
DOI：
10.1143/jjap.49.032402
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发表时间：
2010
影响因子：
1.5
通讯作者：
T. Ishibashi
中科院分区：
文献类型：
--
作者：
Hiroshi Ito;Hiroshi Yamamoto;T. Furuta;T. Ishibashi
研究了亚太赫兹脉冲信号在InP基片共面波导中的传输波形。InP/InGaAs单向载流子光电二极管（UTC-PD）使用1.55 µm光信号产生约1.4 ps宽度的电脉冲。脉冲轮廓被不对称地修改，并且带宽随着脉冲的传播而显著退化。数值计算表明，这种修正主要是由基片介电常数的频散引起的。虽然脉冲轮廓和带宽降低，但亚太赫兹范围内的高频傅立叶分量在传播后仍保留相当大的分量，这表明波导集成UTC-PD作为在1.55 µm工作的太赫兹时域光谱器件的潜力。
The waveform of a sub-terahertz pulse signal propagating through a coplanar waveguide fabricated on an InP substrate is investigated. An electrical pulse of about 1.4 ps width is generated by an InP/InGaAs uni-traveling-carrier photodiode (UTC-PD) using a 1.55 µm light signal. The pulse profile is asymmetrically modified and the bandwidth is markedly degraded as the pulse propagates. Numerical calculation indicates that the modification is basically caused by the frequency dispersion of the substrate dielectric constant. Although the pulse profile and bandwidth are degraded, high-frequency Fourier components in the sub-terahertz range are revealed to remain considerably after the propagation, demonstrating the potential of the waveguide-integrated UTC-PD as a terahertz time-domain spectroscopy device operating at 1.55 µm.