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21 May 2002 Improved velocity mismatch in traveling-wave coplanar waveguide photodetector with thick ground-metal-line
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Proceedings Volume 4650, Photodetector Materials and Devices VII; (2002)
Event: Symposium on Integrated Optoelectronic Devices, 2002, San Jose, California, United States
Bandwidth of a traveling-wave photodetector (TWPD) is limited by the optical absorption coefficient, velocity and impedance mismatches, and the drift time of photo-generated carriers in the intrinsic region. In these parameters, velocity and impedance mismatches have much influence on the bandwidth of TWPD. In this paper, we focus on mismatches, and propose a novel design to enhance the bandwidth. In the new structure, the thickness of a ground electrode increases as much as the ridge thickness. It forces the structure to have characteristics similar to a coplanar waveguide. We simulate this structure by finite different time domain Method in three dimensions and look-over frequency dependent parameters by Fourier transform for the detailed analysis of microwave characteristics such as characteristic impedance, microwave effective index, and microwave attenuation of TWPD. As a result, we obtain 50 (Omega) impedance matching and 89.7 % velocity matching using our novel structure.
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Sang-Jun Yoon, Seong-Hae Ok, Young-Seol Yoon, Soon-Chel Kong, and Young-Wan Choi "Improved velocity mismatch in traveling-wave coplanar waveguide photodetector with thick ground-metal-line", Proc. SPIE 4650, Photodetector Materials and Devices VII, (21 May 2002);

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