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Compact, cost-effective and frequency-tunable continuous-wave (CW) THz systems are preferable for spectroscopic applications such as atmospheric remote sensing and molecular spectral analysis [1]. Usually, one uses two distributed feedback (DFB) lasers with slightly different frequencies and photomixing [2]. Conventional photomixers such as photoconductive antennas require high bias voltage and have...
Continuous wave (CW) THz spectroscopy, exploiting the 1.55 μο telecom wavelength and technologies [1], promises diverse beneficial applications in, e.g., medical imaging, industry, security, and non-destructive material testing. However, in order to enable these complex applications, compact and novel spectroscopy systems, based on cost-effective and non-complex techniques, have to be developed. Accordingly,...
This discuss the generic advantages of using photonics for THz applications especially for highly spectral efficient THz communications and sensitive THz spectroscopy systems.
Here, we propose a novel leaky-wave antenna operating in the V-band. The antenna provides high broadside efficiency and low return loss in the frequency range of operation from 50 to 70 GHz. The antenna consists of an array of substrate integrated waveguide fed dipoles and can be fabricated through cost-effective PCB processes. High peak directivities of over 20 dBi are obtained for a compact (4 ×...
Here, we present a compact photonic transmitter module featuring an integrated InP-based 1.55 μm triple transit region photodiode (TTR-PD) chip and a WR-12 rectangular waveguide output for E-band (60–90 GHz) radio-over-fiber applications. In order to enable work capability in broadband wireless E-band communications over long- and medium-range distances, the fabricated TTR-PD module provides excellent...
This paper focuses on the development and characterization of a novel E-band planar bias-tee (BT) circuit featuring a high-speed millimeter wave photodiode (mm-wave PD) module to be integrated in next generation access and mobile networks (5G). The designed bias-tee circuit together with the integrated mm-wave PD chip, i.e., triple transit region photodiode (TTR-PD) allows the development of high-power...
Here, a millimeter wave photodiode (mm-wave PD) integration platform for development of high-power Radio-over-Fiber (RoF) wireless photonic transmitters (PTs) is presented. The platform features a novel planar bias-tee network design making use of a single quarter-wave coupled-line (CL) technique and two slotted split-ring resonators (SRRs) integrated in the DC bias line. The introduced bias-tee network...
This paper presents a novel planar bias-tee (BT) circuit comprising a quarter-wave single coupled-line (SCL) section designed on 127 µm thick ROGERS RT/duroid 5880 laminate for E-band (71–76 GHz) wireless photonic transmitters. The BT circuit enables proper biasing for millimeter wave photodiodes (mm-wave PDs) through the RF-choke, and in addition, protects the hybrid integrated RF amplifier from...
This paper describes a robust radio-over-fiber wireless link system for use in wireless extension and mobile backhaul applications. The wireless link operates at 71–75 GHz E-band carrier frequencies and can transmit ultra-high access data such as Gigabit Ethernet or OC-48 up to 2.5 Gbps. Enabling photonic technologies, system configurations, and lab trials are presented.
We present a substrate integrated waveguide (SIW) antenna designed for 60 GHz indoor Radio-over-Fiber photonic transmitters. For broad-band applications (57–64 GHz) a return loss (RL) higher than 7 dB and a front-to-back ratio (FTBR) of 17 dB are achieved. Alternative resonant solutions are also introduced to achieve RL > 10 dB and FTBR = 21 dB.
We present a novel transition from grounded coplanar waveguide (GCPW) to substrate integrated waveguide (SIW), designed on a ROGERS 5880 laminate for 60 GHz Radio-over-Fiber (RoF) photonic transmitters. The transition serves as connection between a 60 GHz photodiode (PD) chip and a suitable SIW antenna. In contrast to previous designs, our approach makes use of a quarter-wave coupled-lines (CL) section...
The 7 GHz bandwidth recently allocated worldwide in the 60 GHz band for unlicensed wireless applications has opened the possibility to a wide range of indoor/outdoor wireless gigabit-per-second applications [1].
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