ROADM is the gateway of the all-optical network
One of the key technologies. Its main purpose is to further realize the "photonicization" (optical switching) of nodes on the basis of "photonicization" of lines.
ROADM evolves to CDC-F ROADM, which basically realizes extremely strong optical switching capability. However, it is still not all-optical
The ultimate solution.
There are some problems with ROADM. One of the biggest problems is the complexity of connecting fibers


ROADM system architecture
ROADMs usually connect optical fibers one by one according to the expansion of services. Planning may change over time
If the network needs to be adjusted, or the network needs to be adjusted, the optical fiber will be continuously added.
Over time, the fiber connection becomes chaotic, which brings difficulties to operation and maintenance. With ROADM, the number of racks is also higher than
More, take up more space.
Therefore, a better and more suitable all-optical switching technology was brought to the fore, that is, OXC.
OXC, the full name is optical cross-connect, optical cross-connect.
Like ROADM, OXC is also an optical transmission device that can exchange optical signals between different optical paths.
The concept of OXC actually existed around 2000. In a sense, ROADM is a special feature of OXC
For special implementation, OXC includes ROADM.
From the perspective of traditional architecture, OXC is composed of modules such as optical cross-connect matrix, input interface, output interface, and management control unit.
become . Optical cross-connect matrix is the core of OXC.