Performance characteristics of recently developed superluminescent diodes (SLDs) based on double quantum-well (InGa)As heterostructure and InAs/AlGaAs/GaAs quantum-dot heterostructure are presented. Emission spectra of these SLDs cover spectral bands 960-1080 nm and 1100-1230 nm respectively. Owing to their usage, combined light sources of BroadLighter series cover now the entire NIR-range of 770-1230 nm. New prototypes of swept-wavelength light sources in the range of 820-1080 nm based on quantum-well broadband SOAs and tunable acousto-optic filters are described.

We propose a binomial form of the interaction of an electron and a proton and study the classical solution of the Kepler problem and the scattering of electrons by protons. The derived formulas allow one to calculate the deflection angles and the trajectories of motion of electrons with energies from several eV to hundreds of M eV with impact parameters up to 10 −13 cm.

In work on the basis of static model of a structure of atoms it is shown that the gravitational and electrostatic interactions have the same nature. The electrostatic interaction is the interaction of electric charges at small distances, whereas the gravitational interaction is the interaction of electric charges at large distances.Keywords: the gravitation nature, a binomial potential, static model of atom, the scattering of electrons by protons

No abstract

A tunable laser containing a recently developed travelling wave semiconductor optical amplifier (SOA) of the red spectral region as an active element and an acousto-optic tunable filter in an external fibre ring cavity is studied. Continuous wavelength tuning was achieved within a spectra band up to 20 nm wide with a rate up to 104 nm s−1 at a spectral linewidth below 0.04 nm and a cw output power up to 2 mW. The use of one more similar SOA as an output power amplifier made it possible to increase the output power to 15 mW.