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What's the Structures of ROADM?

In order to realize non-blocking switching and adding/dropping of wavelengths, the new generation of ROADM nodes are required to be colorless, directionless and contentionless (CDC ROADM).

The following are five types of ROADM structures. The focus is on how they support CDC functions.

Fig.2 shows ROADM structure #1. The NNI is constructed with 1×N WSSs. The number of WSSs for a M-dimensional ROADM is 2M. The figure shows only three dimensions. The UNI includes several add/drop modules (the figure shows only two of them). Each add/drop module has two 1×N WSSs linked back-to-back for signal dropping and a 1×N WSS linked to a power splitter for signal adding. According to the function of 1×N WSS, the ROADM structure can support colorless and directionless add/drop of signals. However, when the dimension of the ROADM node is more than the number of add/drop modules, contention happens at the links in the red circle. Maybe we can add the add/drop modules. But the cost is not cheap. Thus this ROADM structure is defined as a CD ROADM and doesn’t meet the CDC requirement.



Read more from HYC Blog, <The Structures of ROADM>


Marketing at HYC Co., Ltd, a China manufacturer of fiber connectivity,WDM, PLC splitter and high-density datacom cabling over 19 years.
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