Innovative ultra-BROadband ubiquitous Wireless communications through terahertz transceivers

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Publications

Analysis of Resonant Tunnelling Diode Oscillators under Optical Modulation

Publication . Tavares, J. S.; Pessoa, L. M.; Figueiredo, José; Salgado, H. M.

In this paper, we investigate the optical modulation characteristics of a resonant tunnelling diode (RTD) oscillator. This preliminary work on the first RTD-PD oscillators with an optical window available from the iBROW project demonstrate that this device can effectively be used to accomplish amplitude and frequency modulation with light injection.

2017Conference object

Restricted access

Resonant tunnelling diode terahertz sources for broadband wireless communications

Publication . Wasige, Edward; Alharbi, Khalid H.; Al-Khalidi, Abdullah; Wang, Jue; Khalid, Ata; Rodrigues, Gil; Figueiredo, José; Sadwick, L. P.; Yang, T.

This paper will discuss resonant tunnelling diode (RTD) sources being developed on a European project iBROW (ibrow. project. eu) to enable short-range multi-gigabit wireless links and microwave-photonic interfaces for seamless links to the optical fibre backbone network. The practically relevant output powers are at least 10 mW at 90 GHz, 5 mW at 160 GHz and 1 mW at 300 GHz and simulation and some experimental results show that these are feasible in RTD technology. To date, 75 - 315 GHz indium phosphide (InP) based RTD oscillators with relatively high output powers in the 0.5 - 1.1 mW range have been demonstrated on the project. They are realised in various circuit topologies including those that use a single RTD device, 2 RTD devices and up to 4 RTD devices for increasingly higher output power. The oscillators are realised using only photolithography by taking advantage of the large micron-sized but broadband RTD devices. The paper will also describe properties of RTD devices as photo-detectors which makes this a unified technology that can be integrated into both ends of a wireless link, namely consumer portable devices and fibre-optic supported base-stations (since integration with laser diodes is also possible).

2017Conference object

Open access

Resonant tunneling diode oscillators for optical communications

Publication . Watson, Scott; Zhang, Weikang; Wang, Jue; Al-Khalidi, Abdullah; Cantu, Horacio; Figueiredo, José; Wasige, Edward; Kelly, Anthony E.; Costa, M. F. M.

The ability to use resonant tunneling diodes (RTDs) as both transmitters and receivers is an emerging topic, especially with regards to wireless communications. Successful data transmission has been achieved using electronic RTDs with carrier frequencies exceeding 0.3 THz. Specific optical-based RTDs, which act as photodetectors, have been developed by adjusting the device structure to include a light absorption layer and small optical windows on top of the device to allow direct optical access. This also allows the optical signal to directly modulate the RTD oscillation. Both types of RTD oscillators will allow for seamless integration of high frequency radio and optical fiber networks.

2017Conference object

Open access

Modelling of optoelectronic circuits based on resonant tunneling diodes

Publication . Rei, João F. M.; Foot, James A.; Rodrigues, Gil; Figueiredo, José; Costa, M. F. M.

Resonant tunneling diodes (RTDs) are the fastest pure electronic semiconductor devices at room temperature. When integrated with optoelectronic devices they can give rise to new devices with novel functionalities due to their highly nonlinear properties and electrical gain, with potential applications in future ultra-wide-band communication systems (see e.g. EU H2020 iBROW Project). The recent coverage on these devices led to the need to have appropriated simulation tools. In this work, we present RTD based optoelectronic circuits simulation packages to provide circuit signal level analysis such as transient response. We will present and discuss the models, and evaluate the simulation packages.

2017Conference object

Restricted access

Resonant tunnelling diode based high speed optoelectronic transmitters

Publication . Wang, Jue; Rodrigues, G. C.; Al-Khalidi, Abdullah; Figueiredo, José; Wasige, Edward; Costa, M. F. M.

Resonant tunneling diode (RTD) integration with photo detector (PD) from epi-layer design shows great potential for combining terahertz (THz) RTD electronic source with high speed optical modulation. With an optimized layer structure, the RTD-PD presented in the paper shows high stationary responsivity of 5 A/W at 1310 nm wavelength. High power microwave/mm-wave RTD-PD optoelectronic oscillators are proposed. The circuitry employs two RTD-PD devices in parallel. The oscillation frequencies range from 20-44 GHz with maximum attainable power about 1 mW at 34/37/44GHz.

2017Conference object

Open access