Title :
Improving bandwidth of parallel-fed travelling wave photo detectors
Author :
Livani, Abdolber Mallah ; Kaatuzian, Hassan
Author_Institution :
Dept. of Electr. Eng., Amirkabir Univ. of Technol. (Tehran Polytech.), Tehran, Iran
Abstract :
Parallel-fed travelling wave photo detectors (TWPDs) are used frequently in high power, high bandwidth applications. However increasing the number of photodiodes within their structure in order to increasing high power capabilities significantly reduces bandwidth. So there is trade-off. We have improved -3dB bandwidth of a parallel-fed TWPD, with four photodiodes, by varying its structural parameters. Resultant bandwidth of the photo detector is 105GHz which shows 25GHz improvement with respect to TWPDs that have been reported previously. S22 of this photo detector is below -10dB within its bandwidth which shows that Bragg frequency is much higher than bandwidth.
Keywords :
microwave detectors; millimetre wave detectors; photodetectors; photodiodes; Bragg frequency; bandwidth 105 GHz; bandwidth reduction; frequency 25 GHz; gain -3 dB; parallel-fed TWPD; parallel-fed travelling wave photodetector; photodiode; power capability; structural parameter; Electron optics; Photonics; electrical model; parallel-fed; traveling wave photo detector;
Conference_Titel :
Electrical Engineering (ICEE), 2012 20th Iranian Conference on
Conference_Location :
Tehran
Print_ISBN :
978-1-4673-1149-6
DOI :
10.1109/IranianCEE.2012.6292366
