共查询到8条相似文献,搜索用时 15 毫秒
1.
2.
J. Zubia G. Aldabaldetreku G. Durana J. Arrue F. Jimnez 《Laser \u0026amp; Photonics Reviews》2008,2(3):182-202
This paper reviews the theoretical analysis of light propagation we have carried out on multimode multi‐step index (MSI) optical fibres. Starting from the Eikonal equation, we derive the analytical expressions that allow calculating the ray trajectories inside these fibres. We also analyse the effects of leaky rays on the transmission properties of MSI fibres. For this purpose, a single analytical expression for the evaluation of the ray power transmission coefficient is calculated. Afterwards, we investigate the effects of extrinsic and intrinsic coupling losses on the performance of MSI fibres, providing analytical expressions to calculate the coupling loss and, also, determining the most critical parameters. Finally, we carry out a comprehensive numerical analysis of the fibre bandwidth under different source configurations. 相似文献
3.
4.
We study the propagation of thickness-stretch waves in a piezoelectric plate of polarized ceramics with thickness poling or crystals of class 6 mm whose sixfold axis is along the plate thickness. For device applications we consider long waves with wavelengths much longer than the plate thickness. A system of two-dimensional equations in the literature governing thickness-stretch, extensional, and symmetric thickness-shear motions of the plate is further simplified. The equations obtained can be used to analyze piezoelectric plate acoustic wave devices operating with thickness-stretch modes. 相似文献
5.
In this work, a modified Galerkin method is used to study the modal and propagation behaviour of generic integrated optical
structures. The paraxial propagation equation is solved through non-linear mapping of the transverse plane and subsequent
Galerkin approach. The differential equation is thus transformed into a specific finite-dimension linear problem. The field
evolution is then calculated step-wise by approximating the exponential propagator through an Arnoldi iterative procedure.
A similar approach is applied to the corresponding eigenproblem. 相似文献
6.
In this work, a modified Galerkin method is used to study the modal and propagation behaviour of generic integrated optical structures. The paraxial propagation equation is solved through non-linear mapping of the transverse plane and subsequent Galerkin approach. The differential equation is thus transformed into a specific finite-dimension linear problem. The field evolution is then calculated step-wise by approximating the exponential propagator through an Arnoldi iterative procedure. A similar approach is applied to the corresponding eigenproblem. 相似文献
7.