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.
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16 May 2013
TL;DR: The results show that a single mode and large mode area fiber with an acceptable permissible bending radius can be obtained when the authors design SCF with optimized structure parameters.
Abstract: We analyze numerically the dependence of segmented cladding fibers (SCF) characters, including the effective V-number, the effective fundamental mode area and the permissible bending radius of fundamental mode, on the structure parameters of the fiber and the signal wavelength with the methods of radial effective index and transmission matrix. The results show that a single mode and large mode area fiber with an acceptable permissible bending radius can be obtained when we design SCF with optimized structure parameters. The effective fundamental area is as large as 1948.93μm2 with proper fiber parameters. It will benefit the fabrication of the SCF for applications in high power fiber lasers.
TL;DR: In this article, a dual-Talbot cavity with reflected mirrors on each side of a photonic crystal fiber is designed to lock the in-phase mode against out-of-phase modes.
Abstract: An effective mode selection is important for the multi-core photonic crystal fiber (PCF) to obtain good output. Talbot cavity is popular to lock the in-phase mode, but few satisfactory experimental results have been reported. In this paper, a dual-Talbot cavity with reflected mirrors on each side of PCF is designed to lock the in-phase mode. The design gains the advantage of in-phase mode against out-of-phase mode. What’s more, it can weaken the influence brought by the imperfect end facet of the fiber. The corresponding theoretical analyses and the experiment are taken. The experimental results suggest that the dual-Talbot cavity improves the capacity of mode selection.
12 Nov 2001
TL;DR: In this paper, the authors suggested that the standard method of measuring PMD by interferometry is inadequate and that it fails to address the presence of both random and deterministic PMD in a fibre.
Abstract: This paper has suggested that the standard method of measuring PMD by interferometry is inadequate. In particular it fails to address the presence of both random and deterministic PMD in a fibre. Such a situation can lead to erroneous results. This paper has shown that one method of detecting this situation is by use of the FT properties of convolution.
TL;DR: In this paper, a fundamental relation between the cross sectional conflnement of an arbitrary mode of a general waveguide and its propagation length is found, and it is shown that due to material loss of the waveguide, the propagation length shrinks as the conflnements of the mode increases.
Abstract: A fundamental relation between the cross sectional conflnement of an arbitrary mode of a general waveguide and its propagation length is found. It is shown that due to material loss of the waveguide, the propagation length shrinks as the conflnement of the mode increases. Normalized second central moment of magnetic energy density in the cross section plane of the waveguide is used as a measure of mode size and it is found that for a given mode size, there is a limit for the waveguide propagation length. This limit depends solely on permittivity of the waveguide material and its surrounding medium. As an application, this result provides a lower bound for propagation loss in subwavelength optical conflnement in plasmonic waveguides which are of special interest for their nano-meter mode dimensions.
16 Dec 2002
TL;DR: In this article, the authors investigated the optimum coupling of a free space Gaussian beam into a corrugated waveguide as well as forming of suitable launch patterns for diverse applications.
Abstract: Efficient transmission of high power microwaves and their launching can be achieved in corrugated waveguides by particular mixtures of hybrid modes. The optimum coupling of a free space Gaussian beam into a corrugated waveguide as well as forming of suitable launch patterns for diverse applications are investigated. There are many different schemes for mode conversion in corrugated waveguides to meet the specific requirements of different users. This paper reports on three different principles, a calculation method and a new type of mode converter based on varying the wall impedance, without inner diameter change.