Title :
A Detailed Investigation of UTC Traveling Wave Photodetectors
Author :
Pasalic, Damir ; Vahldieck, Rudiger
Author_Institution :
Lab. for Electromagn. Fields & Microwave Electron., Swiss Fed. Inst. of Technol., Zurich
Abstract :
Effects of the absorber´s thickness on the UTC TWPD´s performance are investigated. This is an important parameter because it affects both external efficiency and the bandwidth of the device. The analysis of the photodetectors is done using a hybrid drift-diffusion-TLM method, which takes into consideration both, carrier dynamics and RF propagation characteristics. To improve the external efficiency of the UTC TWPD, a thicker absorber is needed. However, a thicker absorber also reduces the transit bandwidth of the photodetector. It is found that the bandwidth of a high frequency UTC TWPD with a thick absorber can be improved by optimizing the length of the device
Keywords :
photodetectors; photodiodes; transmission line matrix methods; RF propagation characteristics; TLM method; UTC photodiodes; carrier dynamics; drift-diffusion method; traveling wave photodetectors; Bandwidth; Electrons; Millimeter wave measurements; Optical mixing; Optical saturation; Optical waveguide theory; Optical waveguides; Photodetectors; Photodiodes; Radio frequency; Drift diffusion method; TLM method; Traveling wave photodetectors; UTC photodiodes;
Conference_Titel :
Microwave Symposium Digest, 2006. IEEE MTT-S International
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-9541-7
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2006.249893
