Interference (wave propagation)

About: Interference (wave propagation) is a research topic. Over the lifetime, 26086 publications have been published within this topic receiving 321110 citations.

Direct observation of photon pairs at a single output port of a beam-splitter interferometer

Abstract: Quantum theory predicts that two indistinguishable photons incident on a beam-splitter interferometer exit together (the pair emerges randomly from one port or the other). We use a special photon-number-resolving energy detector for a direct observation of this quantum-interference phenomenon. Simultaneous measurements from two such detectors, one at each beam-splitter-interferometer output port, confirm the absence of cross coincidences. Photon-number-resolving detectors are expected to find use in other quantum-optics and quantum-information-processing experiments.

A non-Gaussian approach to the performance analysis of UWB TH-BPPM systems

Abstract: We investigate the performance of a time hopped-binary pulse position modulation system in the presence of multi-user interference. Since the exact characteristic function (as well as the pdf) for the multiple access interference is not known, and the Gaussian approximation (especially in presence of a small number of users) has been shown to be very poor, a new, non-Gaussian, approach is proposed. We first present an approximate characteristic function for the multiple access interference and the corresponding probability of error of the system; we then compare the analytical results with simulations and with the common Gaussian approximation.

On the Potential of Interference Rejection Combining in B4G Networks

Abstract: Beyond 4th Generation (B4G) local area networks will be characterized by the dense uncoordinated deployment of small cells. This paper shows that inter-cell interference, which is a main limiting factor in such networks, can be effectively contained using Interference Rejection Combining (IRC). By simulation we investigate two significantly different interference scenarios with dense small cell deployment. The results show that IRC brings considerable improvement in outage as well as in peak and median throughputs in both scenarios, and thus has a big potential as a capacity and coverage enhancing technique for B4G. The IRC gain mechanism depends strongly on the interference scenario and to some extent on the use of frequency reuse. These results are achieved with no coordination between cells and suggests that MIMO rank adaptation and IRC can be done independently.

Interference of coherent spin waves in micron-sized ferromagnetic waveguides

Abstract: We present experimental observations of the interference of spin-wave modes propagating in opposite directions in micron-sized Ni81Fe19-waveguides. To monitor the local spin-wave intensity distribution and phase of the formed interference pattern, we use Brillouin light scattering microscopy. The two-dimensional spin-wave intensity map can be understood by considering the interference of several waveguide eigenmodes with different wavevectors quantized across the width of the stripe. The phase shows a transition from linear dependence on the space coordinate near the antennas characteristic for propagating waves to discrete values in the center region characteristic for standing waves.

Optical interference coatings.

Abstract: The OSA topical meeting on Optical Interference Coatings held in February 1976 at Asilomar is briefly reported on, the state of the art surveyed, and future directions recognized.