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…(Read More)
Polarisation multiplexing is commonly used in 100Gb/s line side transmission as a method to increase the bit rate over the line without increasing the transmitted symbol rate. Using polarisation controllers it is possible to generate two perpendicular polarised optical signals on the same wavelength for transmission through a single fibre. As two separate signals…(Read More)
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…(Read More)
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…(Read More)
So what exactly is the difference between the line side and client side of the network? The client side of the network is where traffic will come on-ramp into the optical backbone. In this case the client side interface will be used to interconnect between the metro networks and the optical backbone. So…(Read More)
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