Zobrazeno 1 - 10
of 117
pro vyhledávání: '"S.F. Helfert"'
Publikováno v:
Optical and Quantum Electronics. 45:245-255
A longitudinally structured surface waveguide is examined and the effect of the structuring on the wave guiding properties is explored. The waveguide structure is examined in three distinct wavelength regions and the results are discussed and compare
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c7ac7d02f7918991d16cf6bdf32d1003
https://doi.org/10.1007/s11082-012-9619-3
https://doi.org/10.1007/s11082-012-9619-3
Autor:
S.F. Helfert
Publikováno v:
Optical and Quantum Electronics. 37:185-197
The determination of Floquet modes for asymmetric periodic structures is presented. Starting with open-or short-circuit parameter descriptions of the periods a difference equation system is developed that allows the computation of the Floquet modes.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0921923f1fe7e6c75643b77b43bfe51d
https://doi.org/10.1007/s11082-005-1137-0
https://doi.org/10.1007/s11082-005-1137-0
Autor:
S.F. Helfert
Publikováno v:
Optical and Quantum Electronics. 36:87-107
Periodic structures like Bragg-gratings are important components of optical circuits. The analysis of these devices can be done very efficiently by combining eigenmode propagation methods with Floquet's theorem. A particular problem is the determinat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::329688097e4987e361f606d93a02257e
https://doi.org/10.1023/b:oqel.0000015632.23175.40
https://doi.org/10.1023/b:oqel.0000015632.23175.40
Publikováno v:
IEEE Journal of Quantum Electronics. 37:928-935
A comprehensive numerical model for the analysis of vertical-surface emitting-lasers is presented. An optical, electrical, and thermal submodel are introduced. The complete analysis is based on the method of lines. The temperature distribution and th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2c2b52b775533f67bfcc55fba71222a5
https://doi.org/10.1109/3.929594
https://doi.org/10.1109/3.929594
Autor:
S.F. Helfert, Reinhold Pregla
Publikováno v:
Optical and Quantum Electronics. 33:343-358
Reflections occur whenever different waveguide sections are concatenated. In this paper, we will give approximate formulas for determining the reflection coefficient. Starting with generalized transmission line equations we will derive general formul
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4c5225ad902dd6cefe64c743a1fb28cc
https://doi.org/10.1023/a:1010834615308
https://doi.org/10.1023/a:1010834615308
Autor:
S.F. Helfert, Reinhold Pregla
Publikováno v:
Optical and Quantum Electronics. 32:681-690
A wide angle beam propagation algorithm is presented, which is based on generalized transmission line (GTL) equations. Besides the discretization, no further approximation is introduced. In principle, a full vectorial analysis is possible, and anisot
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::13f2584d1596a9247012af90efbc2023
https://doi.org/10.1023/a:1007097924554
https://doi.org/10.1023/a:1007097924554
Autor:
Reinhold Pregla, S.F. Helfert
Publikováno v:
Optical and Quantum Electronics. 31:721-732
A modification of the finite difference scheme for thin dielectric layers is presented and implemented into the method of lines. The thin layers may be placed between two consecutive discretisation lines, i.e. no line is inside the layer. The analysi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3898af5a31d32f0a2b11f8b9fbf39ef7
https://doi.org/10.1023/a:1006929303579
https://doi.org/10.1023/a:1006929303579
Publikováno v:
Optical and Quantum Electronics. 30:343-358
Spectral properties of a very deep Bragg grating operating in a first diffraction order on a single-mode planar waveguide have been studied theoretically. It is shown that the scattering loss can be low (a few percent), the reflectivity very high (ov
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ccf603c12862a88908f27723bbd0c53d
https://doi.org/10.1023/a:1006964000620
https://doi.org/10.1023/a:1006964000620
Akademický článek
Tento výsledek nelze pro nepřihlášené uživatele zobrazit.
K zobrazení výsledku je třeba se přihlásit.
K zobrazení výsledku je třeba se přihlásit.
Akademický článek
Tento výsledek nelze pro nepřihlášené uživatele zobrazit.
K zobrazení výsledku je třeba se přihlásit.
K zobrazení výsledku je třeba se přihlásit.