Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002spie.4650..242y&link_type=abstract
Proc. SPIE Vol. 4650, p. 242-249, Photodetector Materials and Devices VII, Gail J. Brown; Manijeh Razeghi; Eds.
Physics
Scientific paper
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.
Choi Young-Wan
Kong Soon-Chel
Ok Seong-Hae
Yoon Sang-Jun
Yoon Young-Seol
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