Erbium Doped Fibre Lasers up t 1618 nm for Optical Communication beyond the L-band

Martin Kristensen, Poul Varming, Jesper Bo Jensen, Vibeke Claudia Lauridsen, Jørn Hedegård Povlsen, Henrik Nørskov Poulsen, Alvaro A. Buxens, Anders Clausen, Palle Jeppesen, Stig Nissen Knudsen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearch


Up to a few months ago it was expected theoretically that erbium doped DFB fibre lasers could not be made to operate at wavelengths above the L-band (1570nm-1610nm). This is due to the combination of very low gain and problems with two-photon absorption in the erbium. In addition semiconductor DFB lasers are difficult to get beyond the L-band. Therefore no transmission systems have ever been made in this wavelength region despite that low loss transmission should still be possible in standard fibres. With the increasing demand for optical bandwidth it will soon be essential to use the entire low loss region for optical fibres. Communication beyond the L-band will therefore probably be necessary within the next 1-3 years.Through careful optimisation of the DFB fibre laser cavity and by using a high gain fibre we have demonstrated stable single-mode lasers up to 1618nm. We have performed 10Gbit/s transmission over 80km with such a DFB fibre laser at 1613nm. Only a minor power penalty was observed compared to standard transmission.We also show that the intrinsic properties of the DFB fibre lasers remain very good at these long wavelengths. We even observe a few dB improvement of the noise-floor suppression. For frequencies above 1MHz the RIN noise drops below the measurement limit for a state-of-the-art HP lightwave analyser.
Original languageEnglish
Title of host publicationPaper to DOPS annual Meeting
Number of pages26
Publication date1999
Publication statusPublished - 1999
EventDOPS, Annual meeting - Lyngby, Danmark
Duration: 1 Jan 1999 → …


ConferenceDOPS, Annual meeting
CityLyngby, Danmark
Period01/01/1999 → …

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