Core and Wavelength Allocation for Joint Optimization in Quantum Access Networks

In this paper, we investigate measures to simultaneously improve the performance of classical and quantum key distribution systems in quantum access networks. First, we construct a multicore-fiber-based quantum access network architecture that supports simultaneous access to classical and quantum signals, and establish theoretical models of noise on classical and quantum channels. Secondly, a jointly optimized core wavelength allocation (JOCWA) scheme is proposed, which is applicable to multi-core fibers with any number of cores. Finally, simulation results show that the JOCWA scheme can improve the optical signal-to-noise ratio of the classical system by at least 20 dB, and can extend the secure transmission distance by about 35% compared with the benchmark scheme.