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Mode division multiplexing is a promising technique that enables highly parallel and compact on-chip optical communications, but its scalability has been hampered by the crosstalk so far. By exploiting supermodes in closely packed waveguide arrays, low crosstalk between waveguides can be achieved when phase mismatch condition is met. This paper considers two techniques to achieve phase mismatch: waveguide...
We present the design and simulation of a high-gain low-profile Continuous Transverse Stub (CTS) antenna array excited by a parallel-plate PCB-made Beam Forming Network (BFN). The radiating part consists of 32 radiating slots fed in parallel by hollow parallel-plate waveguides. The pillbox coupler exciting the CTS array is designed on a dual-layer organic dielectric stack-up using SIW technology....
We present a new waveguide slot configuration able to radiate a circular polarization with a very low axial ratio. This configuration is mainly intended as a circularly polarized element to be used in an array. Both left-hand and right-hand circular polarization can be independently obtained and therefore this configuration could be used to realize a polarization agile antenna. The design approach...
Slotted waveguide array antenna with compound slots is proposed. This configuration is able to radiate a circular polarization with a very low axial ratio. Both left-hand and right-hand circular polarization can be independently obtained and therefore this configuration could be used to realize a polarization agile antenna. An planar array of 18×18 elements with uniform spacing is realized in Ka-band...
We investigate the propagation of surface plasmon polaritons (SPPs) in the graphene sheet arrays (GSA) consisting of periodically stacking graphene sheets. Thanks to the strong coupling, SPPs experience a linear diffraction relation in the GSAs. The unique feature is helpful in restrain diffraction of SPPs during propagation. By connecting two GSAs with different periods, negative refraction of SPPs...
A theoretical model of the mode-locking of light bullets in a planar slab waveguide array geometry is presented. The model yields three-dimensional localized light bullets that act as global attractors for particular parameter values. These light bullets can be controlled via non-uniformities in the gain applied to the array. This manipulation is robust and allows for bullet routing as well as the...
A novel fast and accurate full-wave approach to the analysis of a wide class of slotted waveguide arrays and finite multilayer waveguide arrays with dielectric cover is presented. The numerical-analytical solution is based on Galerkin method with weighted Chebyshev and Gegenbauer polynomials as basis functions explicitly accounting for the field asymptotic at the edges. An extremely fast convergence...
We show that elegant and inspiring photonics can be achieved in inhomogeneous waveguide arrays. We engineer light flow in waveguide arrays via patterning the coupling strength between waveguides which is key for light distribution within the discrete metamaterial. Applications range from multiport beam-steering discrete analogues of reflection and refraction for Bloch waves to a threshold-less all-optical...
We present a new technique to fill arbitrary patterns of a photonic crystal fiber selectively with high nonlinear liquids. Thus we can create waveguides and waveguide arrays with tailored dispersion, nonlinearity, and spatial arrangement.
We present a comprehensive experimental analysis of the switching and routing behaviour of light in two-dimensional evanescently coupled waveguide arrays. Exploring the unique properties of such systems, we propose different networking schemes for sophisticated logical operations.
Manipulation of light beams and pulses in nonlinear photonic lattices or waveguide arrays is attracting increasing attention, due to the potential to control spatial beam shaping combined with manipulation of temporal and spectral characteristics. In particular, photonic lattices created in a medium with quadratic nonlinearity can facilitate ultra-fast all-optical switching through parametric wave...
Multidimensional optical solitons in continuous Kerr media are unstable and prone to collapse. Several mechanism have been identified to prevent collapse like saturating nonlinearity, spatio-temporal aberrations, and nonlocal response. On the contrary, discrete optical system such as waveguide arrays can sustain the propagation of staAcircnot ble localized wavepackets both in space and time, even...
A microfabricated compound eye lens, compatible to a natural compound eye shows a spherical arrangement of integrated optical units called artificial ommatidia. Each consists of a self-aligned microlens and waveguide. The increase of the waveguide length is an indispensible prerequisite for obtaining high resolution images through an artificial compound eye for wide field-of-view imaging as well as...
This article is evaluating parallel processing in electromagnetic simulations for computationally demanding application, using developed FDTD code. A waveguide lens antenna which is complex and large in terms of wavelengths has been simulated and a prototype has been fabricated and measured. Simulated and measured radiation patterns are compared and showing good agreement. The approach of using parallel...
Through this study, the usefulness of two forms of impedance match tuners, a) plain sheath cover, and b) patch-array cover, for FPAs has been ascertained. This work thus marks an inaugural effort towards the impedance matching of FPAs, especially for the lower frequency bands, in which the problems associated with the increased severity of mutual coupling losses have been of primary concern. It has...
We observe nonlinear pulse reshaping of femtosecond pulses propagating in a waveguide array. The reshaping is due to non-linear coupling between waveguides. The output temporal width shows power-dependent pulse shortening.
In this paper we have presented our recent experimental results on exact dynamic localization in AlGaAs waveguides arrays. The mature fabrication processes associated with III-V semiconductors allows precise control over etch depth, waveguide refractive index profile and device layout which in turn allows us to obtain excellent agreement between experiment and theory.
This paper demonstrates a quasi-incoherent evolution of fully coherent light in femtosecond laser written waveguide arrays. This effect is in strong contrast to the well-known spatial coherence for homogeneous media which describes a decreasing degree of coherence for an increasing distance between two sources.
The feed circuit and waveguide arrays with slots cut in can be analyzed be the method of moments separately. By cascading the S-matrices considering of only dominant TE10 mode, full-structure analysis is achieved. The calculated results for reflection and directivity coincide with the simulated ones by HFSS. The accuracy for the analysis method is confirmed. As the key point, the calculation time...
The launcher of a high power millimeter wave is designed for electron cyclotron heating system of ITER plasma. The quasi-optical system was adopted for a transmission lines in the launcher, which simplify the configuration largely comparing with the reference design of the waveguide arrays, and that the heat load was reduced by less than half. On the high power experiment with transmission line of...
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