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Multimodefasern

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Lichtwellenleiter für die optische Nachrichtenübertragung

Part of the book series: Nachrichtentechnik ((NACHRICHTENTECH,volume 16))

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Zusammenfassung

Während Monomodefasern vor allem für Breitbandübertragung über sehr große Entfernungen in Frage kommen, haben Multimodefasern große technische Bedeutung für kostengünstige Übertragungssysteme für kleine bis mittlere Entfernungen und Bitraten (≤10...15 km, ≤140 Mbit/s, Näheres in Abschnitt 7.4). Der Kerndurchmesser 2a und auch die numerische Apertur AN sind bei Multimode-fasern wesentlich größer als bei Monomodefasern; daher sind bei Steckern und Spleißen gröbere mechanische Toleranzen zulässig und als Sender können außer Lasern auch inkohärente Lichtquellen (LED) verwendet werden, weil deren geringere Strahldichte hier ausreicht, um brauchbare Lichtleistungen einzukoppeln. Die meisten Multimodefasern sind Gradientenfasern mit typischen Zahlenwerten von 2a =50 μm, AN≈0,2, ∆≈0,009, d.h. v ≈37 bei λ = 0,85 μm und v 24 bei λ = 1,3 μm. Diese Fasern können nach (4.62) mehrere hundert Moden führen und erreichen Bandbreite-Längenprodukte von einigen GHz•km. Für einfache Kurzstrecken-Übertragungssysteme sind auch Stufenfasern in Gebrauch mit typischen Zahlenwerten von 2a≈100 μm und A N≈0,3.

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  1. Zentrale Forschung und Entwicklung, Siemens AG, München, Deutschland

    Dr.Ing. Siegfried Geckeler

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  1. Dr.Ing. Siegfried Geckeler
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© 1990 Springer-Verlag Berlin Heidelberg

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Geckeler, S. (1990). Multimodefasern. In: Lichtwellenleiter für die optische Nachrichtenübertragung. Nachrichtentechnik, vol 16. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-83951-1_6

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  • DOI: https://doi.org/10.1007/978-3-642-83951-1_6

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-51727-6

  • Online ISBN: 978-3-642-83951-1

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