6 papers
Do we really need the weight force?
J. M. L. Figueiredo
In 1901 the third Conference Generale des Poids et Mesures (CGPM) defined the weight of a body as ``the product of its mass and the acceleration due to gravity". In practical terms…
Advantages of adopting the operational definition of weight
J. M. L. Figueiredo
With rare exceptions, in high school and college/university physics courses literature and in journals of physics, the weight is defined as a gravitational force or an exclusive co…
Modeling of a Resonant Tunneling Diode Optical Modulator
J. J. N. Calado, J. M. L. Figueiredo, C. N. Ironside
The integration of a double barrier resonant tunneling diode within a unipolar optical waveguide provides electrical gain over a wide bandwidth. Due to the non-linearities introduc…
Optical modulation at around 1550 nm in a InGaAlAs optical waveguide containing a InGaAs/AlAs resonant tunnelling diode
J. M. L. Figueiredo, A. R. Boyd, C. R. Stanley +3
We report electro-absorption modulation of light at around 1550 nm in a unipolar InGaAlAs optical waveguide containing a InGaAs/AlAs double-barrier resonant tunneling diode (DB-RTD…
Optical modulation in a resonant tunneling relaxation oscillator
J. M. L. Figueiredo, C. R. Stanley, A. R. Boyd +1
We report high speed optical modulation in a resonant tunneling relaxation oscillator consisting of a resonant tunneling diode (RTD) integrated with a unipolar optical waveguide an…
Ultra-low voltage resonant tunnelling diode electroabsorption modulator
J. M. L. Figueiredo, C. N. Ironside, C. R. Stanley
Embedding a double barrier resonant tunnelling diode (RTD) in an unipolar InGaAlAs optical waveguide gives rise to a very low driving voltage electroabsorption modulator (EAM) at o…