Bruno Romeira

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A hybrid optoelectronic integrated circuit (OEIC) comprising a laser diode (LD) driven by a resonant tunnelling diode (RTD) can output various optical and electrical signal patterns that include self-sustained oscillations, sub-harmonic and harmonic locking and unlocked signals, with potential applications in optical communication systems.
We demonstrate a photonic bistable spiking circuit with a graphene excitable laser for cascadable logic. This technology could be a potential candidate for applications in novel all-optical devices for information processing and computing. Photonic neuromorphic processing exploits the biophysics of neuronal computation algorithms [1] to provide a wide range(More)
We investigate the dynamics of optoelectronic oscillator (OEO) systems based on resonant tunneling diode photodetector (RTD-PD) and laser diode hybrid integrated circuits. We demonstrate that RTD-based OEOs can be noise-activated in either monostable or bistable operating conditions, providing a rich variety of signal outputs—spiking, square pulses,(More)
We investigate a photonic regenerative memory based upon a neuromorphic oscillator with a delayed self-feedback (autaptic) connection. We disclose the existence of a unique temporal response characteristic of localized structures enabling an ideal support for bits in an optical buffer memory for storage and reshaping of data information. We link our(More)
Phase-locked oscillators based on resonant tunneling diodes are used in this study to implement transceiver components that perform conversion between optical and wireless phase shift-keyed signals using injection-locked oscillator techniques. Three different links are demonstrated at frequencies of 940 MHz, 1.3 GHz, and 3.2 GHz that are capable of locking(More)
We show experimental results of clock recovery from return-to-zero (RZ) format data by using injection locking of a free-running optoelectronic oscillator (OEO) circuit, which consists of a resonant tunneling diode (RTD) oscillator integrated circuit with both a detector and optical source. Error free extraction of a clock signal from the RTD-OEO is shown(More)
We investigate the generation of mixed mode oscillations in a periodic forced optoelectronic circuit comprising a high-speed resonant tunneling diode (RTD) and a laser diode (LD). The driven RTD-LD exhibits a two-state level operation, characterized by either periodic or aperiodic intermittent patterns with a high amplitude followed by small amplitudes,(More)
We report on photo-detectors consisting of an optical waveguide that incorporates a resonant tunneling diode (RTD). Operating at wavelengths around 1.55 μm in the optical communications C band we achieve maximum sensitivities of around 0.29 A/W which is dependent on the bias voltage. This is due to the nature of RTD nonlinear current-voltage characteristic(More)
Pico-cell based access networks are increasingly seen as a promising solution for the growing mobility and bandwidth user demands. A recently developed resonant tunneling diode oscillator integrated with a photodetector and a laser diode (RTD-PD-LD), is being considered as a viable low cost pico-cell solution for radio-over-fiber based distributed antenna(More)