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http://dx.doi.org/10.4218/etrij.16.0115.0882

SOA-Integrated Dual-Mode Laser and PIN-Photodiode for Compact CW Terahertz System  

Lee, Eui Su (Broadcasting & Media Research Laboratory, ETRI)
Kim, Namje (Broadcasting & Media Research Laboratory, ETRI)
Han, Sang-Pil (Broadcasting & Media Research Laboratory, ETRI)
Lee, Donghun (ICT Material & Components Research Laboratory, ETRI)
Lee, Won-Hui (Broadcasting & Media Research Laboratory, ETRI)
Moon, Kiwon (Broadcasting & Media Research Laboratory, ETRI)
Lee, Il-Min (Broadcasting & Media Research Laboratory, ETRI)
Shin, Jun-Hwan (Broadcasting & Media Research Laboratory, ETRI)
Park, Kyung Hyun (Broadcasting & Media Research Laboratory, ETRI)
Publication Information
ETRI Journal / v.38, no.4, 2016 , pp. 665-674 More about this Journal
Abstract
We designed and fabricated a semiconductor optical amplifier-integrated dual-mode laser (SOA-DML) as a compact and widely tunable continuous-wave terahertz (CW THz) beat source, and a pin-photodiode (pin-PD) integrated with a log-periodic planar antenna as a CW THz emitter. The SOA-DML chip consists of two distributed feedback lasers, a phase section for a tunable beat source, an amplifier, and a tapered spot-size converter for high output power and fiber-coupling efficiency. The SOA-DML module exhibits an output power of more than 15 dBm and clear four-wave mixing throughout the entire tuning range. Using integrated micro-heaters, we were able to tune the optical beat frequency from 380 GHz to 1,120 GHz. In addition, the effect of benzocyclobutene polymer in the antenna design of a pin-PD was considered. Furthermore, a dual active photodiode (PD) for high output power was designed, resulting in a 1.7-fold increase in efficiency compared with a single active PD at 220 GHz. Finally, herein we successfully show the feasibility of the CW THz system by demonstrating THz frequency-domain spectroscopy of an ${\alpha}$-lactose pellet using the modularized SOA-DML and a PD emitter.
Keywords
CW terahertz; CW terahertz system; terahertz spectroscopy; photomixer; pin-photodiode; dual-mode laser; tunable lasers;
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Times Cited By KSCI : 2  (Citation Analysis)
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