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RTDopto
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Activities in Optoelectronics and Nanoelectronics
Previous activities
dealt with integrated optic WDM devices and optoelectronic applications of resonant
tunnelling diodes (RTDs). Two devices that came-out
from the RTD investigation, the Resonant Tunnelling Diode Electro-Absorption
Modulator (RTD-EAM) and the Resonant Tunnelling Diode Electro-Optic Modulator
(RTD-EOM), were patented and an attempt to commercialize optoelectronic
solutions based on this RTD technology led to a spun-out by the University
of Glasgow
in 2002 [1].
The current activities are focused on the development of new optoelectronic circuit functionalities based on negative differential conductance
devices. The work includes hybrid and monolithic
integration of Resonant Tunnelling Diodes (RTDs) with laser diodes and with photo-detectors aiming novel non-linear optoelectronic integrated circuits for chaos
based communication systems* and novel RF-optical-RF interfaces for cellular networks. For more information on RTD based optoelectronic devices see book
chapter Resonant Tunnelling Optoelectronic
Circuits.
* Decifrar
o caos
Publications
Current projects:
The main
topics are:
So far the major achievements are:
- Demonstration of an optoelectronic voltage
controlled oscillator based on the hybrid integration of a RTD with a
laser diode (LD).
- Description of the RTD-LD optoelectronic
voltage controlled oscillator (OVCO) as a Liénard oscillator.
- Synchronization of the RTD-LD optoelectronic
voltage controlled oscillator (OVCO) to wireless signals.
- Novel Wireless-Photonics-Wireless Interfaces
based on RTD-LD and RTD-photodiode (RTD-PD) optoelectronic
voltage/optical controlled oscillators.
- RTD-LD and RTD-PD circuits for generating
optical and electrical chaotic carriers.
- Novel optoelectronic oscillators (OEO) based on
the integration of RTD-PDs with laser diodes.
- Low phase noise optoelectronic voltage/optical
controlled oscillators.
Sponsors:
Patents and spin-outs:
Optoelectronic
device, Charles Ironside and José Figueiredo, US2004247218 (INPADOC patent family).
Improved optoelectronic device, Charles
Ironside, Colin Stanley and José Figueiredo, WO0072383 (INPADOC patent family).
Essient
Photonics Ltd.,
2002 (MICRONEWS).
Departamento de Física,
Faculdade de Ciências e Tecnologia, Universidade do Algarve,
Campus de Gambelas, 8005-139
FARO, Portugal
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