  Adopting quantum communication to modern networking requires transmitting
quantum information through fiber-based infrastructure. We report the first
demonstration of superdense coding over optical fiber links, taking advantage
of a complete Bell-state measurement enabled by time-polarization
hyperentanglement, linear optics, and common single-photon detectors. We
demonstrate the highest single-qubit channel capacity to date utilizing linear
optics, $1.665 \pm 0.018$, and we provide a full experimental implementation of
a hybrid, quantum-classical communication protocol for image transfer.
