We demonstrate several optical beating sources based on 1.55 μm photonic devices. Broadband antenna-integrated,
low-temperature-grown (LTG) InGaAs photomixers for widely tunable continuous-wave THz generation and detection
are also verified. The novel optical beat sources show a beat frequency tuning range from 0.3THz to over 1.34 THz. The
dual-mode laser diode (DML) consists of one phase and two active sections. Micro-heaters are used to independently
tune the wavelengths of the two DML laser modes. Broadband antenna-integrated, LTG InGaAs photomixers are used as
THz wave generators and detectors. This use of 1.55 μm photonic devices could connect current THz and InP-based
communication technologies because the well-developed InP-based optoelectronic technologies are already expected to
enable the integration of tunable LD sources with other optical components such as semiconductor optical amplifiers
(SOAs), electro-absorption modulators, and waveguide-type THz photomixers. As well as realizing an optical fibercoupled
THz time-domain spectroscopy (TDS) system, we also successfully achieved continuous frequency tuning of the
CW THz emissions. Our results show that photomixing using the photonic devices is a promising approach to realize
compact, cost-effective, and portable THz spectrometer.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kyung Hyun Park ; Namje Kim ; Hyunsung Ko ; Han-Cheol Ryu ; Jung-Woo Park, et al.
"Portable terahertz spectrometer with InP related semiconductor photonic devices", Proc. SPIE 8261, Terahertz Technology and Applications V, 826103 (February 9, 2012); doi:10.1117/12.907629; http://dx.doi.org/10.1117/12.907629