  To meet the requirements of time-frequency networks and enable frequency
downloadability for nodes along the link, we demonstrated the extraction of
stable frequency signals at nodes using a mode-locked laser under the condition
of 100 km laboratory fiber. The node consists of a simple structure that
utilizes widely used optoelectronic devices and enables plug-and-play
applications. In addition, the node can recover frequency signals with multiple
frequencies, which are useful for scenarios that require different frequencies.
Here, we experimentally demonstrated a short-term frequency instability of
$2.83\times {{10}^{-13}}$@1 s and a long-term frequency instability of
$1.18\times {{10}^{-15}}$@10,000 s at the node, which is similar to that at the
remote site of the frequency transfer system. At the same time, frequency
signals with different frequencies also achieved stable extraction with the
same performance at the node. Our results can support the distributed
application under large-scale time-frequency networks.
