Topic
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.
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TL;DR: A new concept to measure rotation angles based on a fiber-optic modal Mach-Zehnder interferometer is demonstrated by using a nonadiabatic taper cascaded with a long-period fiber grating.
Abstract: A new concept to measure rotation angles based on a fiber-optic modal Mach-Zehnder interferometer is demonstrated by using a nonadiabatic taper cascaded with a long-period fiber grating. Information about the magnitude of the rotation angle can be obtained from the measurement of the interference pattern visibility, and under certain conditions it is also possible to obtain the sign of the rotation angle from the induced phase variation in the fiber interferometer.
124 citations
27 Nov 2000
TL;DR: A simulation study of a cellular system using multiple-input multiple-output (MIMO) antenna techniques along with adaptive modulation and aggressive frequency reuse shows how much MIMO systems outperform systems with receive-diversity-only when noise dominates.
Abstract: We describe a simulation study of a cellular system using multiple-input multiple-output (MIMO) antenna techniques along with adaptive modulation and aggressive frequency reuse. We show, for the case of 3 transmit and 3 receive antennas, how much MIMO systems outperform systems with receive-diversity-only when noise dominates. When co-channel interference from surrounding cells dominates, the differences shrink, as do the absolute numbers. We quantify these reductions for the specific cases studied, and discuss further areas of research.
123 citations
19 Sep 2008
TL;DR: In this paper, the concepts of Kohler illumination and Kohler integrators are discussed and its limitations and constrains for laser beam homogenizing and beam shaping are discussed, as well as how micro-optical elements comprised of a randomly varying component can be used to smooth out interference and speckle effects within the far field intensity profile.
Abstract: Laser beam homogenizing and beam shaping are key enabling technologies for many applications today. Periodic
microlens arrays are widely used to transform Gaussian or non-uniform beam profile into a uniform "flat-top". Each
microlens element samples the input beam and spreads it over a given angular distribution. Incoherent beams that are
either temporally or spatially incoherent can produce very uniform intensity profiles. However, coherent beams will
experience interference effects in the recombination of the beams generated by each individual microlens element.
Rotating or moving elements, such as a rotating diffuser or a vibrating optical fiber, are used to average these
interference patterns. An integration of several different patterns will smooth out the intensity profile. Unfortunately, this
averaging is not always possible. Some applications require a single shot from a pulse laser or work at very high data
rates that do not allow an averaging over 10 to 50 frames. We will discuss the concepts of Kohler illumination and
Kohler integrators and its limitations and constrains for laser beam homogenizing. We will show how micro-optical
elements comprised of a randomly varying component can be used to smooth out interference and speckle effects within
the far-field intensity profile.
123 citations
TL;DR: In this article, a double-slit interference scheme with thermal light was investigated and the results showed that the visibility of the interference pattern can be dramatically enhanced while the resolution can also be improved when the order N becomes larger.
Abstract: The arbitrary Nth-order intensity correlation measurement with thermal light is both theoretically and experimentally investigated. In a double-slit interference scheme with thermal light, we compare the results for higher- and lower-order intensity correlation and demonstrate that the visibility of the interference pattern can be dramatically enhanced while the resolution can also be improved when the order N becomes larger. The experimental results are in agreement with our theoretical analysis.
123 citations