Silicon modulators are promising devices for future optical networks to realize large capacity transmission with a low cost and a small footprint. In this paper, a silicon modulator for quadrature phase-shift-keying format is designed, fabricated and characterized. The fabricated modulator chip has short length of 3.5 mm, which is approximately one tenth of a widely used lithium niobate modulat...

The aim of the paper is to design a digital BPSK modulator for Ground Penetrating Radar applications. . The BPSK (Binary Phase Shift Keying) is one of the three basic binary modulation techniques. It has as a result only two phases of the carrier, at the same frequency, but separated by 180o. In this paper we took modulation as a main stream and analyzed about BPSK modulation technique on Xilin...

The exact expressions for the symbol error probability (SEP) of hybrid selection maximal ratio combining wireless systems for quadrature phase shift keying (QPSK) is derived and analyzed in multipath fading environment. Independent rayleigh fading diversity branch is assumed for analysis with equal Signal-to-Noise ratio averaged over the fading channels and coherent detection of quadrature phas...

Quantum enhanced receivers are endowed with resources to achieve higher sensitivities than conventional technologies. For application in optical communications, they provide improved discriminatory capabilities for multiple nonorthogonal quantum states. In this work, we propose and experimentally demonstrate a new decoding scheme quadrature phase-shift encoded signals. Our receiver surpasses th...

A coherent optical beam forming network principle using phase-locked semiconductor lasers as sources is presented. For this scheme the spectral purity of the intermediate frequency derived from mixing the signals from two semiconductor lasers is considered and the relationship between the linewidths of the lasers in a satellite transmitter and the phase error at the detector of a microwave diff...

We present that surface plasmon polariton, side-coupled to a gain-assisted nanoresonator where the absorption is overcompensated, exhibits a prominent phase shift up to π maintaining the flat unity transmission across the whole broad spectra. Bandwidth of this plasmonic phase shift can be controlled by adjusting the distance between the plasmonic waveguide and the nanoresonator. For a moderate ...

Space-shift keying (SSK) is considered for multihop multiple-input-multiple-output (MIMO) networks. In SSK, only one among ns = 2 m available transmit antennas, Here ‘m’ input bits are mapped through antenna index values. The number of bits can be SSK modulated depends on number of transmitter antenna used in MIMO. We consider two different systems of multihop cooperation, where each node has m...