Generation and Propagation of Sub-Terahertz Pulse Signal Using Waveguide-Integrated InP/InGaAs Uni-Traveling-Carrier Photodiode
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概要
- 論文の詳細を見る
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.
- 2010-03-25
著者
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Ito Hiroshi
Center for Natural Sciences, Kitasato University
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Furuta Tomofumi
Ntt Photonic Laboratories Ntt Corpration
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Yamamoto Hiroshi
Center For Endovascular Neurosurgery Osaka Neurological Institute
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Tadao Ishibashi
NTT Electronics Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan
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