Guard Bands – Enablers For Co-existence Of Coherent 100G Signals And Non-coherent 10G NRZ Signals

On , in All Posts, General, Line Side, by Tony Goodchild

The coherent 100G transmission systems from network equipment vendors are showing an amazing robustness and tolerance for high PMD and CD. Some are reporting a PMD tolerance of up to 100ps DGD and above, while the CD tolerance can be in the range of up to 50.000ps/nm. Therefore the ideal network for deploying such coherent […]

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Understanding Phase Modulation For 100G Transmission

On , in All Posts, General, Line Side, by Tony Goodchild

There are a number of challenges to achieving 100Gb/s optical transmission rates using the technologies that have been deployed at 10Gb/s and even 40Gb/s. Using traditional transmission technologies such as NRZ modulation on the line will result in very poor spectral efficiency and a 100G signal using NRZ would not fit into the standard 50GHz […]

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Are Chromatic Dispersion Measurements Required Before Installing Coherent Systems?

On , in All Posts, Line Side, by Tony Goodchild

Bearing in mind that the Chromatic Dispersion (CD) tolerance of coherent systems can be up to 50.000ps/nm it is clear that CD measurements have lost part of their value. (We will be discussing the line side technology and the effect of chromatic and polarisation mode dispersion in an article very soon) However there are several […]

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