• Journal of the Institute of Electronics Engineers of Korea SD
• /
• v.39 no.4
• /
• pp.63-71
• /
• 2002

In this paper, we present microwave characteristics of traveling-wave photodetectors (TWPD) using the finite-difference time-domain method (FDTD). Current and voltage in the time domain are calculated by the FDTD. Also, characteristic impedance and propagation constant in frequency domain are obtained from the time-domain data. As the thickness of i-layer gets thicker and the waveguide width gets narrower, TWPD's show less microwave loss and higher velocity. The 50Ω impedance matching design is achieved for 2.4${\mu}{\textrm}{m}$ waveguide width and 1.2${\mu}{\textrm}{m}$ thickness of i-layer at 100 GHz.

• ETRI Journal
• /
• v.34 no.6
• /
• pp.942-945
• /
• 2012

A high-speed traveling-wave photodetector (TWPD) with an InGaAs absorber is designed and realized. The bandwidth of the TWPD is measured using electro-optic sampling techniques. The bandwidth is 410 GHz, which shows that the RC limitation is overcome. While the TWPD shows a low responsivity of 0.06 A/W at 1,550 nm, this value can be improved through further optimization of the structure without a sacrifice in bandwidth.

• Proceedings of the Optical Society of Korea Conference
• /
• 2000.02a
• /
• pp.14-15
• /
• 2000

We study the microwave characteristics of traveling-wave photodetector using the finite-difference time-domain method. We present two parameters for design, the width of PIN region and the thickness of i-layer, and analyze TWPD's property in frequency domain.