Which PON element is responsible for using patch panels?

The optical distribution network (ODN) is the correct choice as it serves as the backbone of the passive optical network (PON) and is integral in the distribution and management of optical signals among various components. Patch panels are often utilized within the ODN to facilitate the organization and connectivity of fiber optic cables, ensuring that the fibers can be easily accessed for maintenance, reconfiguration, or testing.

Patch panels allow for a centralized point to manage connections and perform consolidations, which is critical in the ODN where numerous fibers from different locations converge. They help in minimizing signal loss and maintaining high-quality connections by allowing for efficient routing and organization of the cables.

Other components like the optical line terminal (OLT), optical network unit (ONU), and optical splitter, while vital in the overall PON architecture, have different roles. The OLT is the source of the PON signal, the ONU connects end-users to the network, and the optical splitter is responsible for dividing the optical signal to multiple outputs. Thus, they do not directly involve the use of patch panels as part of their primary functions.