Non-linearity requirements and technologies on a 100G line

In general, optical signals with a higher modulation rate have a lower tolerance for fiber non-linear effect. The strength of fiber non-linear effect is related to the incident optical power, optical spectral width of optical signals, properties of modulation formats, fiber dispersion coefficient, and number of fiber spans. Some special modulation format techniques, such as phase modulation and return-to-zero (RZ) modulation, enable the signals to better withstand fiber non-linear effect during transmission.

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