Numerical analysis of traveling-wave photodetectors' bandwidth using the finite-difference time-domain method

被引：16

作者：

Kong, SC ^{[1
]}

Lee, SJ ^{[1
]}

Lee, JH ^{[1
]}

Choi, YW ^{[1
]}

机构：

[1] Chung Ang Univ, Optoelect & Opt Commun Lab, Seoul 156756, South Korea

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2002年 / 50卷 / 11期

关键词：

finite-difference time-domain (FDTD) method; RF optic link; traveling-wave photodetector (TWPD);

D O I：

10.1109/TMTT.2002.804508

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We present full-wave analysis of traveling-wave photodetectors (TWPDs) using the finite-difference time-domain (FDTD) method. Impulse response in the frequency domain is obtained after time-domain data are calculated by the FDTD method. The impulse response includes the optical field profile, carrier transit time, microwave loss, microwave dispersion, and velocity mismatch all together. Three-decibel bandwidth is analyzed with the thickness of an i-layer and waveguide width as the design parameters. It is shown how transit time and microwave characteristics affect the bandwidth according to the TWPD's length. Three-decibel bandwidth is dominated by carrier transit time in case the device length is shorter than 300-500 mum under the conditions given in this paper. However, if the device length gets longer, microwave characteristics affect the bandwidth.

引用

页码：2589 / 2597

页数：9

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