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Radio Frequency Generator Using Four Wave Mixing in Cascaded Nonlinear Semiconductor Optical Amplifiers

100%

Memon M., Siraj M., Fathallah H., Khan M.

Acta Physica Polonica A

2016

vol. 129

issue 4

832-834

For the last three decades, the phenomenon of four-wave mixing is a significant technique for generation of light at new distinct wavelength. When two distinct laser beams (pump and probe) beat together in a non-linear medium, few modes are increased in the power at same distance from the probe and pump, as a result of four-wave mixing. In this paper, cascading structure of two semiconductor optical amplifiers produces very strong four-wave mixing. This technique is exploited to devise a tunable radio frequency signal generator. The wavelength distance between pump and probe laser beams determines the radio frequency of the generated signal. Using this scheme, it can be observed from the experimental results, that there is an increase of more than 3 dB in signal to noise ratio at 7 Gbits/sec data rate of the 60 GHz generated mm-wave signal. Moreover, the radio frequency can be tuned to hundreds of GHz by varying the distance between the pump and probe signals. This scheme will readily serve as future all optical radars. It is also a key technique for short-range communication systems for military applications. The above scheme can also be monolithically integrated.

Aperiodically Poled Nonlinear Crystals as Sources of Multi-Frequency Laser Radiation

100%

Novikov A., Laptev G.

Acta Physica Polonica A

2007

vol. 112

issue 5

1073-1078

The new multi-frequency process, which consists of three coupled nonlinear optical interactions: two parametric down-conversions and one up-conversion, in aperiodically poled nonlinear crystal is investigated. The spatial dynamics of wave intensities is studied in detail. The possibility of secondary simplification of coupled equations for correct describing the dynamics of wave interactions is demonstrated. The optimal conditions for parametrical instability of the initial stage of wave interactions are found.

Second Harmonic Generation in AlGaAs Nanowaveguides

88%

Rutkowska K., Duchesne D., Volatier M., Arès R., Aimez V., Morandotti R.

Acta Physica Polonica A

2011

vol. 120

issue 4

725-731

In this paper, we investigate semiconductor nanowaveguides (i.e. ridge waveguides with core-widths narrower than 1 μm) intended to act as novel optical light sources through nonlinear wavelength/frequency conversion. In particular, numerical calculations have been performed in order to design suitable photonic devices (fabricated in the AlGaAs/GaAs platform) capable of high efficiency second harmonic generation. Particular interest has been dedicated to the effective conversion of optical signals from 1520-1600 nm (the third telecom window) down to 760-800 nm. We demonstrate that the output wavelength (resulting from modal phase-matching) can be dynamically tuned by proper adjustment of the temperature and/or geometrical parameters of the waveguides. In addition, by changing the waveguide width it is also possible to modify the device dispersion characteristics, giving the possibility to work in the region of anomalous dispersion and thus allowing for the generation of temporal solitons.

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3 Acta Physica Polonica A

1 2016

1 2011

1 2007

1 Aimez V.

1 Arès R.

1 Duchesne D.

1 Fathallah H.

1 Khan M.

1 Laptev G.

1 Memon M.

1 Morandotti R.

1 Novikov A.

1 Rutkowska K.

1 Siraj M.

1 Volatier M.

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Radio Frequency Generator Using Four Wave Mixing in Cascaded Nonlinear Semiconductor Optical Amplifiers

Aperiodically Poled Nonlinear Crystals as Sources of Multi-Frequency Laser Radiation

Second Harmonic Generation in AlGaAs Nanowaveguides