We demonstrate the capability of fabricating extremely high-bandwidth Uni-Traveling Carrier Photodiodes (UTC-PDs) using techniques that are suitable for active-passive monolithic integration with Multiple Quantum Well (MQW)-based photonic devices. The devices achieved a responsivity of 0.27 A/W, a 3-dB bandwidth of 170 GHz, and an output power of -9 dBm at 200 GHz. We anticipate that this work will deliver Photonic Integrated Circuits with extremely high bandwidth for optical communications and millimetre-wave applications.
"The recombined signal is then amplified with an EDFA and transmitted over standard single-mode fiber (SSMF) to the antenna unit (AU). At the AU, the optical LO source beats with the modulated optical signal on an unpackaged uni-travelling carrier (UTC) photodiode  to generate the THz modulated multichannel signal. The modulated THz signal is radiated to the end user through a pair of horn antennas. "
[Show abstract][Hide abstract] ABSTRACT: In this paper, we propose a multi-carrier THz wireless communication system using an injection-locked gain-switched laser as an optical comb source. The phase noise of the 192 GHz signal resulting from the beating of two optical comb lines is theoretically analyzed and experimentally examined. Moreover, a three channel, 10 Gbaud QPSK THz signal is generated, and transmission over 40 km standard single mode fiber (SSMF) is experimentally demonstrated.
IEEE Transactions on Terahertz Science and Technology 01/2015; DOI:10.1109/TTHZ.2015.2418996 · 2.18 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: We experimentally demonstrate photonic generation of a multichannel THz wireless signal at 200 GHz, with data rate up to 40 Gb/s QPSK modulation format using an optical heterodyne technique and digital coherent detection. The BER measurements were carried out for three subcarriers each modulated with 5 Gbaud QPSK or for two subcarriers modulated with 10 Gbaud QPSK, giving a total speed of 30 Gb/s or 40 Gb/s, respectively. The proposed system can provide a high-speed wireless transmission capability by using spectrally efficient subcarrier channels that increase the overall speed and reduce the requirement for electronic bandwidth.
2014 International Topical Meeting on Microwave Photonics / The 9th Asia-Pacific Microwave Photonics Conference, Sapporo, Japan; 10/2014
[Show abstract][Hide abstract] ABSTRACT: A novel parallel optical delay detector is proposed for angle-of-arrival (AOA) measurement of a microwave signal with accuracy monitoring. A theoretical model is built up to analyze the proposed system, including measurement accuracy monitoring. The measurements of AOA are then experimentally investigated with monitored measurement accuracy.
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