Title :
Signal-to-noise performance of a fiber optic subcarrier link using an HBT optoelectronic up-converter
Author :
Suematsu, E. ; Imai, N.
Author_Institution :
ATR Opt. & Radio Commun. Res. Labs., Kyoto, Japan
Abstract :
The signal-to-noise performance of a fiber optic microwave subcarrier link using an HBT as an optoelectronic up-converter in the millimeter-wave band has been experimentally investigated for the first time. This paper shows that the HBT not only has a high photodetection ability in direct photodetection but also has a high conversion ratio between a microwave subcarrier of an optical signal and a millimeter-wave carrier. The link signal-to-noise ratio of an HBT up-converter at IF=3.2 GHz/RF=30 GHz is 11 dB and 21 dB higher than that of a HBT direct photodetector and a PIN photodetector at 30 GHz, respectively. The HBT optoelectronic up-converter has the function of a photodetector, an IF amplifier and a mixer.<>
Keywords :
frequency convertors; heterojunction bipolar transistors; interference (signal); mixers (circuits); optical links; photodetectors; 3.2 GHz; 30 GHz; HBT optoelectronic up-converter; IF amplifier; direct photodetection; fiber optic subcarrier link; microwave subcarrier link; millimeter-wave band; mixer; signal-to-noise performance; Heterojunction bipolar transistors; Optical amplifiers; Optical fibers; Photodetectors; Signal to noise ratio;
Conference_Titel :
Microwave Symposium Digest, 1994., IEEE MTT-S International
Conference_Location :
San Diego, CA, USA
Print_ISBN :
0-7803-1778-5
DOI :
10.1109/MWSYM.1994.335290
