Bandwidth Enhancement By Correcting Chromatic Dispersion Of 1.55µm Single-Mode Fibre Links

J. J. Bernard; J. Guillon

doi:10.1117/12.963596

6 October 1986 Bandwidth Enhancement By Correcting Chromatic Dispersion Of 1.55µm Single-Mode Fibre Links

J. J. Bernard, J. Guillon

Proceedings Volume 0630, Fibre Optics '86; (1986) https://doi.org/10.1117/12.963596
Event: Sira/Fibre Optics '86, 1986, London, United Kingdom

Abstract

For many years research has been engaged to fight 1.55 μm chromatic dispersion of long-haul single-mode fibre links. Some solutions have usually been proposed, like low dynamic spectral width sources, as distributed-feedback lasers, or optical fibres with particular structure, as quadruple-clad or triangular index profile fibres. These solutions present some problems of reliability, reproducibility and performance improvement, which still remain to be solved. A new device is proposed to fight chromatic dispersion and then to improve span x bit-rate product of a given classical step-index fibre link. It consists in a wavelength demultiplexing done by a diffraction grating, in order to spatially separate each longitudinal mode of the laser. Each of them is then coupled to a short multimode fibre whose length is adjusted to compensate exactly for the corresponding delay time induced in the link by its total chromatic dispersion. The ends of these fibres finally converge on a fast photodetector which provides a signal showing no distorsion and being insensitive to the laser mode-partition noise. A bandwidth enhancement of almost one order of magnitude has been demonstrated.

Citation Download Citation

J. J. Bernard and J. Guillon "Bandwidth Enhancement By Correcting Chromatic Dispersion Of 1.55µm Single-Mode Fibre Links", Proc. SPIE 0630, Fibre Optics '86, (6 October 1986); https://doi.org/10.1117/12.963596

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KEYWORDS

Dispersion

Multimode fibers

Diffraction gratings

Structured optical fibers

Fiber optics

Single mode fibers

Modulation

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