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We demonstrate experimentally the feasibility of continuous variable quantumkey distribution (CV-QKD) in dense-wavelength-division multiplexing networks(DWDM), where QKD will typically have to coexist with several co- propagating(forward or backward) C-band classical channels whose launch power is around0dBm. We have conducted experimental tests of the coexistence of CV-QKDmultiplexed with an intense classical channel, for different input powers anddifferent DWDM wavelengths. Over a 25km fiber, a CV-QKD operated over the1530.12nm channel can tolerate the noise arising from up to 11.5dBm classicalchannel at 1550.12nm in forward direction (9.7dBm in backward). A positive keyrate (0.49kb/s) can be obtained at 75km with classical channel power ofrespectively -3dBm and -9dBm in forward and backward. Based on thesemeasurements, we have also simulated the excess noise and optimized channelallocation for the integration of CV-QKD in some access networks. We have, forexample, shown that CV-QKD could coexist with 5 pairs of channels (with nominalinput powers: 2dBm forward and 1dBm backward) over a 25km WDM-PON network. Theobtained results demonstrate the outstanding capacity of CV-QKD to coexist withclassical signals of realistic intensity in optical networks.

Coexistence of continuous variable QKD with intense DWDM classical channels