  We experimentally realize a measurement-device-independent quantum key
distribution (MDI-QKD) system based on cost-effective and commercially
available hardware such as distributed feedback (DFB) lasers and
field-programmable gate arrays (FPGA) that enable time-bin qubit preparation
and time-tagging, and active feedback systems that allow for compensation of
time-varying properties of photons after transmission through deployed fibre.
We examine the performance of our system, and conclude that its design does not
compromise performance. Our demonstration paves the way for MDI-QKD-based
quantum networks in star-type topology that extend over more than 100 km
distance.
