We know optical networks are undergoing significant changes. There continues to be increasing demand for bandwidth, just as 10 Gb/s technology has reached maturity, service providers are already installing higher bit rates, including 40 Gb/s and now 100 Gb/s per wavelength and nowadays 400 Gb/s is receiving a lot of attention. The 50 GHz ITU wavelength grid divides the optical spectrum range into fixed 50 GHz spectrum slots, but it is likely that bit rates greater than 100 Gb/s will not fit into this scheme. Even if sufficiently broad spectrum is available, high data rate signals become increasingly difficult to transmit over long distances. So to properly address this challenge, one needs flexible and adaptive networks equipped with flexible transceivers and network elements that can adapt to the actual traffic needs. The combination of adaptive transceivers, a flexible grid, and intelligent client nodes enables a new “elastic” networking paradigm.
https://www.youtube.com/watch?v=pJ0SPaYxzEM
optiwave is one of the famous simulator used for optical networks simulation
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