2014/12/31 by Rupesh Kumar, Hao Qin, Romain Alléaume · 2 citations
Computer Science · Engineering · Physics and Astronomy · #Channel (broadcasting) #Channel spacing #Computer science #Multiplexing #Noise (video) #Optical Network Technologies #Optics #Photon #Physics #Quantum Information and Cryptography #Quantum key distribution #Quantum optics and atomic interactions #Telecommunications #Wavelength #Wavelength-division multiplexing #quant-ph
paper · pdf · doi:10.1088/1367-2630/17/4/043027
19 pages, 9 figures. Revised version, to appear in New Journal of Physics
arxiv created 2015/03/12 · openalex publication_date 2015/04/15 · arxiv updated 2015/06/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We demonstrate experimentally the feasibility of continuous variable quantum key 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 around 0 dBm. We have conducted experimental tests of the coexistence of CV-QKD multiplexed with an intense classical channel, for different input powers and different DWDM wavelengths. Over a 25 km fiber, a CV-QKD operated over the 1530.12 nm channel can tolerate the noise arising from up to 11.5 dBm classical channel at 1550.12 nm in the forward direction (9.7 dBm in backward). A positive key rate (0.49 kbits s −1 ) can be obtained at 75 km with classical channel power of respectively −3 and −9 dBm in forward and backward. Based on these measurements, we have also simulated the excess noise and optimized channel allocation for the integration of CV-QKD in some access networks. We have, for example, shown that CV-QKD could coexist with five pairs of channels (with nominal input powers: 2 dBm forward and 1 dBm backward) over a 25 km WDM-PON network. The obtained results demonstrate the outstanding capacity of CV-QKD to coexist with classical signals of realistic intensity in optical networks.