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Network integration of quantum key distribution is crucial for its futurewidespread deployment due to the high cost of using optical fibers dedicatedfor the quantum channel, only. We studied the performance of a system running asimplified BB84 protocol at 2.5 GHz repetition rate, operating in the originalwavelength band, short O-band, when multiplexed with communication channels inthe conventional wavelength band, short C-band. Our system could successfullygenerate secret keys over a single-mode fiber with a length of 95.5 km and withco-propagating classical signals at a launch power of 8.9 dBm. Further, wediscuss the performance of an ideal system under the same conditions, showingthe limits of what is possible with a discrete variable system in the O-band.We also considered a short and lossy link with 51 km optical fiber resembling areal link in a metropolitan area network. In this scenario we could exchange asecret key with a launch power up to 16.7 dBm in the classical channels.

The limits of multiplexing quantum and classical channels: Case study of a 2.5 GHz discrete variable quantum key distribution system