  Integration of Quantum Key Distribution (QKD) in existing telecommunication
infrastructure is crucial for the widespread adoption of this quantum
technology, which offers the distillation of unconditionally secure keys
between users. In this letter, we report a field trial between the Points of
Presence (POPs) placed in Treviso and in Venezia - Mestre, Italy, exploiting
the QuKy commercial polarization-based QKD platforms developed by ThinkQuantum
srl and two different standards of single-mode optical fibers, i.e. G.652 and
G.655, as a quantum channel. In this field trial, several configurations were
tested, including the co-existence of classical and quantum signals over the
same fiber, providing a direct comparison between the performances of the G.652
and G.655 fiber standards for QKD applications.
