標題: Characterization and Comparison of GaAs/AlGaAs Uni-Traveling Carrier and Separated-Transport-Recombination Photodiode Based High-Power Sub-THz Photonic Transmitters
作者: Li, Yu-Tai
Shi, Jin-Wei
Huang, C. -Y.
Chen, Nan-Wei
Chen, Shu-Han
Chyi, Jen-Inn
Wang, Yi-Chao
Yang, Chan-Shan
Pan, Ci-Ling
光電工程學系
Department of Photonics
關鍵字: High-power photodiode;uni-traveling carrier photodiode (UTC-PD);separated-transport recombination photodiode (STR-PD);photonic transmitter;submillimeter-wave terahertz (THz)
公開日期: 1-一月-2010
摘要: We describe in detail the characterization of two high-power photonic transmitters based on two different kinds of high-power photodiodes, one a GaAs/AlGaAs based uni-traveling-carrier photodiode (UTC-PD) and the other a separated-transport-recombination photodiode (STR-PD). The diodes operate under optical pulse excitation at the 800 nm wavelength. Both PDs have the same total depletion layer thickness (same theoretical RC-limited bandwidth) and are m integrated with the same broadband micro-machined circular disk monopole antennas to radiate strong sub-THz pulses. However the STR-PD based transmitter exhibits very different dynamic and static performance from that of the UTC-PD based transmitter due to the existence of a low-temperature-grown GaAs (LTG-GaAs) based recombination center inside the active region, and the much thinner thickness of effective depletion layer. Under optical pulse excitation (similar to 480 pJ/pulse), the STR-PD based transmitter exhibits a much lower maximum averaged output photocurrent (1.2 mA versus 0.3 mA) than that of the UTC-PD transmitter, although the radiated electrical pulse-width and maximum peak-power, which are measured by the same THz time-domain spectroscopic (TDS) system, of both devices are comparable. These results indicate that although the recombination center in the STR-PD degrades its DC responsivity, it effectively improves the high-speed and output power performance of the device and eliminates the DC component of the photocurrent, which should minimize device-heating problem during high-power operation. The radiated waveforms of both devices under intense optical pulse illumination also exhibit excellent linearity and strong bias dependent magnitude. This suggests their suitability for application as photonic emitters and possibly as a data modulator in sub-THz impulse-radio communication systems.
URI: http://dx.doi.org/10.1109/JQE.2009.2023366
http://hdl.handle.net/11536/6071
ISSN: 0018-9197
DOI: 10.1109/JQE.2009.2023366
期刊: IEEE JOURNAL OF QUANTUM ELECTRONICS
Volume: 46
Issue: 1
起始頁: 19
結束頁: 27
顯示於類別:期刊論文


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