Title :
1.55-μm wavelength periodic traveling-wave photodetector fabricated using unitraveling-carrier photodiode structures
Author :
Hirota, Yukihiro ; Ishibashi, Tadao ; Ito, Hiroshi
Author_Institution :
NTT Photonics Labs., Kanagawa, Japan
fDate :
11/1/2001 12:00:00 AM
Abstract :
We report the first periodic traveling-wave photodetector fabricated by using unitraveling-carrier photodiodes (UTC-PDs). The photodetector comprises three UTC-PDs with a 0.06-μm absorption layer that is periodically arranged along a coplanar waveguide transmission line. The photoresponse of the photodetector is three times larger than that of a single UTC-PD. A photodetector with terminal resistors at the input end achieves a 3-dB bandwidth of 115 GHz at 1.55 μm. This is almost the same value as that for a single UTC-PD. For one without terminal resistors, the 3-dB bandwidth degrades to 56 GHz as a result of the backward-propagating microwave being reflected at the input end. These results suggest that the photodetector is well designed with both velocity and impedance matchings
Keywords :
coplanar waveguides; impedance matching; microwave photonics; optical communication equipment; photodetectors; photodiodes; 0.06 micron; 1.55 micron; 115 GHz; 56 GHz; absorption layer; backward propagating microwave reflection; coplanar waveguide transmission line; impedance matching; input end; periodic traveling-wave photodetector; photodetector; photoresponse; terminal resistors; unitraveling-carrier photodiodes; velocity matching; Bandwidth; Capacitance; Chromium; Coplanar waveguides; Optical saturation; Optical waveguides; PIN photodiodes; Periodic structures; Photodetectors; Resistors;
Journal_Title :
Lightwave Technology, Journal of
