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Photonics 2018, 5(4), 51; https://doi.org/10.3390/photonics5040051

Impact of Chirp in High-Capacity Optical Metro Networks Employing Directly-Modulated VCSELs

1
Dip. Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
2
Vertilas GmbH, Daimlerstr. 11d, D-85748 Garching, Germany
3
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC/CERCA), Av. C. F. Gauss 7, 08860 Castelldefels, Barcelona, Spain
*
Author to whom correspondence should be addressed.
Received: 31 October 2018 / Revised: 22 November 2018 / Accepted: 23 November 2018 / Published: 27 November 2018
(This article belongs to the Special Issue Lightwave Communications and Optical Networks)
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Abstract

Directly modulated long-wavelength vertical cavity surface emitting lasers (VCSELs) are considered for the implementation of sliceable bandwidth/bitrate variable transceivers for very high capacity transmission (higher than 50 Gb/s per wavelength) in metropolitan area systems characterized by reduced cost, power consumption, and footprint. The impact of the frequency chirp measured for InP VCSELs with different kinds of design (high-bandwidth very short cavity and widely-tunable with micro electro-mechanical systems (MEMS) top mirror) is analyzed in case of discrete multitone (DMT) direct modulation in combination with 25-GHz wavelength selective switch (WSS) filtering. The maximum transmitted capacity for both dual side- and single side-band DMT modulation is evaluated as a function of the number of crossed nodes in a mesh metro network, comparing VCSEL based transmitters performance also with the case of external electro-absorption modulator use. Finally, the maximum reach achieved based on the received optical signal to noise ratio (OSNR) and the fiber span length is discussed. The results confirm the possibility to use directly-modulated long-wavelength VCSELs for the realization of sliceable bandwidth/bitrate variable transmitters targeting 50-Gb/s capacity per polarization, also in the presence of 5 crossed WSSs for reaches of hundreds of kilometers in multi-span Erbium-doped fiber amplified (EDFA) metro links supported by coherent detection. View Full-Text
Keywords: direct modulation; discrete multitone; metro networks; optical communications; vertical cavity surface emitting lasers direct modulation; discrete multitone; metro networks; optical communications; vertical cavity surface emitting lasers
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Rapisarda, M.; Gatto, A.; Martelli, P.; Parolari, P.; Neumeyr, C.; Svaluto Moreolo, M.; Fabrega, J.M.; Nadal, L.; Boffi, P. Impact of Chirp in High-Capacity Optical Metro Networks Employing Directly-Modulated VCSELs. Photonics 2018, 5, 51.

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