STUDY OF OPTICAL HETERODYNE MIXING CHARACTERISTICS IN AN AlInAs/GaInAs TRANSFERRED-SUBSTRATE DOUBLE HETEROJUNCTION BIPOLAR TRANSISTOR

摘要

The beat-frequency dependency of the optical heterodyne mixing characteristics of a transferred-substrate AlInAs/GaInAs double heterojunction bipolar transistor (DHBT) have been investigated from 1 to 25 GHz in 1-GHz steps at a center wavelength of 1319 run. The experimental results show a high-speed but low-responsivity response followed by a low-speed but high-responsivity response. The 3-dB bandwidth of the low-speed response is 3 GHz. Various ways of increasing the high-frequency responsivity are discussed.