title: Quantum key distribution on a 10Gb/s WDM-PON.
abstract: We present the first demonstration of quantum key distribution (QKD) on a multi-user wavelength division multiplexed passive optical network (WDM-PON) with simultaneous, bidirectional 10Gb/s classical channel transmission. The C-Band QKD system operates at a clock rate of 10GHz and employs differential phase shift keying (DPSK). A dual feeder fiber and band filtering scheme is used to suppress classical to quantum channel cross-talk generated by spontaneous Raman scattering, which would otherwise prevent secure key distribution. Quantum keys were distributed to 4 users with negligible Raman cross-talk penalties. The mean QBER value for 4 users was 3.5% with a mean raw key distribution rate of 1.3Mb/s, which decreased to 696kb/s after temporal windowing to reduce inter-symbol interference due to single photon detector timing jitter.
authors.affiliation: Photonic Systems Group, Tyndall National Institute and Department of Physics, University College Cork, Cork, Ireland. iris.choi@tyndall.ie
authors.forename: Iris
authors.initials: I
authors.lastname: Choi
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Young
authors.forename: Paul D
authors.initials: PD
authors.lastname: Townsend