Cisco ONS 15454 High-Power Co-Propagating Raman Unit

The high power counter-propagating unit injects counter-propagating optical power to generate a Raman effect in the span fiber and thus amplifies the signals propagating in the same fiber. Similarly, the co-propagating Raman unit injects co-propagating optical power that also amplifies the signal through a Raman effect in fiber. The signal thus receives amplification from the optical power injected by both these units present on opposite ends of the span.