Optimized channel allocation scheme for jointly reducing four-wave mixing and Raman scattering in the DWDM-QKD system

The Evolution of Quantum Key Distribution Networks: On the Road to the Qinternet

“…To reduce the FWM noise, Sun et al [232] developed a user-specific channel-interleaving aided WDM approach combined with unequal frequency spacing. For jointly suppressing the Raman noise and FWM noise, Niu et al [233] proposed an optimized channel allocation scheme, allowing QKD to tolerate the presence of high-power classical signals conveying many classical channels within a SMF. Based on WDM, a prototype of the quantum metropolitan optical network [156] has been described and characterized, allowing the deployment of a technologically realistic and cost-effective QKD network over commercial telecommunication networks.…”

Quantum key distribution integration with optical dense wavelength division multiplexing: a review

“…Such a grid can be either on, below, or above the DWDM channel frequencies. Several investigations have highlighted the significance of channel allocations in QKD–DWDM networks in terms of further mitigating the FWM effect on the QKD channel [17, 38–40]. According to [41], the separation between the QKD channel and classical channels would mitigate the crosstalk effect, which occurs due to FWM.…”

Resource Optimization in Quantum Access Networks

“…Hence, in general, when the number of users is large, a low value has to be chosen for I, and Raman noise is often the dominant source of noise. On the other hand, when there are a few users in the system and I is quite large (for example 0 dBm), the FWM noise should be mitigated, as proposed in [13]. For a range of scenarios between these two, both Raman noise and FWM noise should be taken into account.…”

“…In [12], optimal wavelength assignment, as an effective method of noise reduction, has been proposed and investigated. In [13], an algorithm for wavelength assignment in DWDM quantumclassical systems has been proposed, which mostly relies on the elimination of FWM noise.…”