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Waveguide

About: Waveguide is a research topic. Over the lifetime, 28522 publications have been published within this topic receiving 375461 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper , the authors demonstrate numerically that spin-dependent chiral coupling can be realized by embedding such an emitter in a waveguide-coupled nanocavity, which supports two near-degenerate, orthogonally polarized cavity modes.
Abstract: Spin-dependent, directional light-matter interactions form the basis of chiral quantum networks. In the solid state, quantum emitters commonly possess circularly polarized optical transitions with spin-dependent handedness. We demonstrate numerically that spin-dependent chiral coupling can be realized by embedding such an emitter in a waveguide-coupled nanocavity, which supports two near-degenerate, orthogonally polarized cavity modes. The chiral behavior arises due to direction-dependent interference between the cavity modes upon coupling to two single-mode output waveguides. Notably, an experimentally realistic cavity design simultaneously supports near-unity chiral contrast, efficient (>95%) cavity-waveguide coupling and enhanced light-matter interaction strength (Purcell factor FP > 70). In combination, these parameters enable the development of highly coherent spin-photon interfaces ready for integration into nanophotonic circuits.

7 citations

Patent
28 Aug 2014
TL;DR: In this article, a linear driver for Mach-Zehnder modulator (MZM) configured in a differential form with two waveguides carrying two traveling waves is presented.
Abstract: The present invention includes a linear driver for Mach-Zehnder modulator (MZM) configured in a differential form with two waveguides carrying two traveling waves. Each waveguide comprises a MZM material configured with either a single segment in 3×MZM length or two split segments with one in 2×MZM length and another one in either 1× or 2×MZM length. By coupling a DC current source supplied with a modulation voltage with each segment thereof for providing electrical modulation signal overlapping with each of the two traveling waves. The modulated traveling waves in the two waveguides then are combined in one output signal by a multimode interference coupler. By properly choosing the configuration of MZM linear segments with optional length ratios, a low power consumption MZM linear driver provides either NRZ or PAM-4 modulation scheme to the input optical signals for telecommunication through silicon photonics.

7 citations

Journal ArticleDOI
TL;DR: In this article, a method for the calculation of the spatial distribution and coherency of pulsed capillary gas laser with waveguide resonators is proposed, and the results of the calculation show that the employment of waveguide Fabry-Perot resonators with internal mirrors for the formation of spatially coherent low-divergence radiation is reasonable unless the pulse duration is small relative to the formation time of stationary modes.

7 citations

Proceedings ArticleDOI
01 Jul 1999
TL;DR: In this article, the linear theory for a relativistic Cherenkov amplifier was developed for a circular waveguide with an inner dielectric rod and an annular electron beam between the rod and outer wall.
Abstract: Waveguide structure with an inner rod supporting slow-wave propagation allows one to combine a TWT-amplifier and a surface wave radiating antenna in a single hybrid device. Such a device could significantly extend the range of possibilities for microwave beam control at the high level of radiated power. In the work presented, the linear theory is developed for a relativistic Cherenkov amplifier, which configuration is a circular waveguide with an inner dielectric rod and an annular electron beam between the rod and outer wall. Dielectric rod antennas typically operate in the fundamental non-axisymmetric HE 11 mode, therefore, the dispersion relation is derived for the general case of non-axisymmetric perturbations. The achievable gain and bandwidth are determined from the numerical solutions of the dispersion relation for various waveguide and beam parameters. Spatial growth rates for the HE 11 mode, symmetric TM 01 mode (usual TWT operating mode), and other high-order modes are compared. Investigations of the parameter space allow one to find sets of parameters where the HE 11 mode dominates. The gain and bandwidth values in this case can be typical for usual relativistic TWTs at accessible beam currents and voltages and reasonable geometries for the X-band frequencies and above. Key characteristics of the proposed concept for a high-power microwave source are formulated, and possible advantages of a hybrid antenna-amplifier are discussed.

7 citations

Patent
21 Aug 2009
TL;DR: In this paper, a plurality of three-dimensional radiator elements are arranged so that their radiating top sides are substantially parallel and so that at least one pair of adjacent radiators are separated by a dielectric gap between sidewalls, the gap behaving like a waveguide which couples electromagnetic interferences with the electromagnetic waves.
Abstract: A plurality of three-dimensional radiator elements, each radiator element transmitting or receiving electromagnetic waves by a radiating top side. The radiator elements are arranged so that their radiating top sides are substantially parallel and so that at least one pair of adjacent radiator elements are separated by a dielectric gap between sidewalls, the gap behaving like a waveguide which couples electromagnetic interferences with the electromagnetic waves. The adjacent radiator elements further comprise a structure to suppress the coupling effect without establishing a galvanic contact with its adjacent radiator element.

7 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231,127
20222,547
2021808
20201,055
20191,157
20181,110