Topic
Equilibrium mode distribution
About: Equilibrium mode distribution is a research topic. Over the lifetime, 928 publications have been published within this topic receiving 14939 citations.
Papers published on a yearly basis
Papers
More filters
25 Aug 1994
TL;DR: In this paper, the authors used a very accurate fiber model to calculate the overlap integral between the fundamental mode of the waveguide and the optical fiber, and the convergence behavior and accuracy of overlap integral calculations with the mode matching method has been investigated.
Abstract: Rectangular core waveguides for integrated optics have been designed by the mode matching (transverse resonance) method. To achieve good coupling between the waveguides and an optical fiber, the core cross section of the waveguide at the fiber/waveguide interface has been optimized with regard to minimum coupling loss. In calculating the overlap integral between the fundamental mode of the waveguide and the fiber a very accurate fiber model has been used. Calculations of the effective index and the field distribution of the fundamental fiber mode with this model have been compared with analytic results for circular step-index-fibers. The convergence behavior and accuracy of overlap integral calculations with the mode matching method has been investigated. The calculations show that losses as low as 0.16 dB can be reached for waveguides with refractive index contrasts in the whole range 0.5 to 2%.
1 citations
TL;DR: In this paper, the influence of input mode mixture in circular oversized waveguide mode converters is investigated. But the results show that the spurious input modes do not simply superimpose onto the output modes, and in some cases they may deteriorate the conversion efficiency for the main output mode.
Abstract: Based on the coupled mode theory, this paper presents the study on the influence of input mode mixture in circular oversized waveguide mode converters. Three kinds of commonly used waveguide mode converters, including the waveguide mode converters with varying wall radius or small axis perturbations, and the waveguide mode converters with bent structures, are taken as the examples. The results show that the spurious input modes do not simply superimpose onto the output modes, and in some cases they may deteriorate the conversion efficiency for the main output mode. Methods for transforming such spurious input mode mixture simultaneously into the main output mode are also presented in this paper.
1 citations
05 Jun 2000
TL;DR: In this article, the influence of Kerr-like nonlinearity on the transmittance of a guiding structure consisting of double mode and single mode step-index fiber sections is estimated.
Abstract: Influence of Kerr-like nonlinearity on the transmittance of a guiding structure consisting of double mode and single mode step-index fiber sections is estimated. The possibility to use such structure for pulse compression is analyzed and parameters of the structure that correspond to the largest effect of pulse compression are determined. Interaction of modes in double mode nonlinear fiber is investigated.
1 citations
22 Oct 2007
TL;DR: In this paper, the design of TE01-TM11 mode converter geometry configuration with traditional waveguide axis constant curvature and improved waveguide sinusoidal curvature is given for more acceptable geometry parameters.
Abstract: The geometry of the mode converter that is required depends on the details of the two modes that are being interchanged. Nonperiodic variations structure can often be used to reduce the length of the converter, but in these devices, virtually all modes may experience significant mode conversion. The design methodology and numerical result for mode converter that are suitable for high-power microwave application are reported. Based on the mode coupling theory, design of TE01-TM11 mode converter geometry configuration with traditional waveguide axis constant curvature and improved waveguide axis sinusoidal curvature is given for more acceptable geometry parameters. The conversion efficiency of 8 mm high-power circular waveguide with waveguide axis sinusoidal curvature is about 99% with bandwidth of 32%.
1 citations
TL;DR: In this article, the phase shift of a weakly guiding optical fiber due to thermal strain is calculated and a relationship for the modal phase shift is presented for both single and two-mode fibers in order to determine sensitivity characteristics of fibers that are subjected to temperature changes.
Abstract: Temperature may be determined by monitoring the modal phase shift of an optical fiber. We present the results of a numerical model that has been developed to calculate the phase shift of a weakly guiding optical fiber due to thermal strain. Whenever an optical fiber is subjected to temperature changes, the optical path length, the index of refraction and the propagation constants of each fiber mode change. In consequence, the modal phase term, beta(ln)L, of the fields is also modified. A relationship for the modal phase shift is presented. This relation is applied to both single mode and two-mode fibers in order to determine the sensitivity characteristics of fibers that are subjected to temperature changes.
1 citations