Article

Orientation-dependent time delays of the first higher-order mode in elliptical-core fibres

Universität Kaiserslautern, Lehrstuhl für Theoretische Elektrotechnik, Kaiserslautern, West Germany
Electronics Letters (Impact Factor: 1.04). 02/1982; DOI: 10.1049/el:19820651
Source: IEEE Xplore

ABSTRACT Time delays of the differently orientated LP11 modes in elliptical-core fibres have been measured in dependence on the wavelength. These measurements permit one to determine the orientation-dependent effective cutoff wavelengths. An empirical expression relating LP11-mode delay splitting due to slight ellipticity and LP01-mode chromatic dispersion is obtained.

0 Bookmarks
 · 
73 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: A universal fiber-optic measurement system, which is useful for measuring loss and dispersion in the 1.06-1.6 mu m wavelength region, is described. The source is a silica fiber Raman laser pumped by a mode-locked and Q -switched Nd:YAG laser at 1.06 μm. Subnanosecond multiple-Stokes pulses in the 1.1-1.6 mu m wavelength region are generated in a low-loss single-mode silica fiber. The use of this near-infrared fiber Raman laser for characterizing various transmission properties of single and multimode test fibers is demonstrated. Loss spectra, intramodal dispersion, and intermodal dispersion data are obtained in the wavelength region of minimum loss and minimum material dispersion for silica fibers.
    IEEE Journal of Quantum Electronics 12/1978; · 2.11 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Thin glass fibers imbedded into a glass cladding of slightly lower refractive index represent a promising medium for optical communication. This article presents simple formulas and functions for the fiber parameters as a help for practical design work. It considers the propagation constant, mode delay, the cladding field depth, and the power distribution in the fiber cross section. Plots vs frequency of these parameters are given for 70 modes.
    Applied Optics 10/1971; 10(10):2252-8. · 1.69 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The direct measurement of cutoff wavelengths from the spectral dependence of the near-field intensity distribution has been improved by selectively exciting the first higher-order mode and applying it to elliptical-core single-mode fibres. Depending on the orientation and polarisation of the first higher-order mode, four different cutoff wavelengths have been identified.
    Electronics Letters 02/1982; · 1.04 Impact Factor