Measurement of an optical fiber using the spectral interferograms obtained at its output

Petr Hlubina

doi:10.1117/12.281205

17 September 1997 Measurement of an optical fiber using the spectral interferograms obtained at its output

Petr Hlubina

Proceedings Volume 3098, Optical Inspection and Micromeasurements II; (1997) https://doi.org/10.1117/12.281205
Event: Lasers and Optics in Manufacturing III, 1997, Munich, Germany

Abstract

The mutual interference of tow linearly polarized modes in the spectral domain has been demonstrated experimentally at the output of a two-mode, step-index optical fiber excited by low-coherence sources having different spectral widths. The corresponding spectral interferograms, which are characterized by the wavelength-dependent periods of modulation of the source spectrum affected by intermodal dispersion, serve as an illustration of the feasibility of a novel experimental method utilizing a high-resolution spectrometer in the evaluation of the spectral dependence of the group optical path difference (OPD) between two modes of an optical fiber. Using the Fourier transform method for the spectral fringe pattern analysis, good agreement between the experimental and the theoretical spectral interferograms has been achieved and characteristics such as the unmodulated spectra and the wavelength dependences of both the visibilities of spectral fringes and the group OPDs between modes exceeding the source coherence length have been obtained. These last two characteristics have also been compared with those obtained using the cross-correlation technique.

Citation Download Citation

Petr Hlubina "Measurement of an optical fiber using the spectral interferograms obtained at its output", Proc. SPIE 3098, Optical Inspection and Micromeasurements II, (17 September 1997); https://doi.org/10.1117/12.281205

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