Mora Almerich, J.; Amaya Ocampo, WA.; Ruiz Alba Gaya, A.; Martínez García, A.; Calvo Díaz-Aldagalán, D.; García Muñoz, V.; Capmany Francoy, J. (2012). Simultaneous transmission of 20x2 WDM/SCM-QKD and 4 bidirectional classical channels over a PON. Optics Express. 20(15):16358-16365. doi:10.1364/OE.20.016358

This paper was published in OPTICS EXPRESS and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://dx.doi.org/10.1364/OE.20.016358. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law We report the transmission of 40 quantum-key channels using WDM/SCM-QKD technology and 4 bidirectional classical channels over a PON. To our knowledge the highest number of quantum key channels simultaneously transmitted that has ever been reported. The quantum signal coexists with classical reference channel which is employed to process the qbits, but it has enough low power to avoid Raman crosstalk and achieving a high number of WDM-QKD channels. The experimental results allow us to determine the minimum rejection ratio required by the filtering devices employed to select each quantum channel and maximize the quantum key rate. These results open the path towards high-count QKD channel transmission over optical fiber infrastructures. The authors wish to acknowledge the financial support of the Spanish Ministry of Science & Innovation and the Generalitat Valenciana through projects CONSOLIDER INGENIO 2010 Quantum Information Technologies and PROMETEO GVA 2008-092 MICROWAVE PHOTONICS. Gisin, N., Ribordy, G., Tittel, W., & Zbinden, H. (2002). Quantum cryptography. Reviews of Modern Physics, 74(1), 145-195. doi:10.1103/revmodphys.74.145 Scarani, V., Bechmann-Pasquinucci, H., Cerf, N. J., Dušek, M., Lütkenhaus, N., & Peev, M. (2009). The security of practical quantum key distribution. Reviews of Modern Physics, 81(3), 1301-1350. doi:10.1103/revmodphys.81.1301 Capmany, J., & Novak, D. (2007). Microwave photonics combines two worlds. Nature Photonics, 1(6), 319-330. doi:10.1038/nphoton.2007.89 Chen, J., Wu, G., Xu, L., Gu, X., Wu, E., & Zeng, H. (2009). Stable quantum key distribution with active polarization control based on time-division multiplexing. New Journal of Physics, 11(6), 065004. doi:10.1088/1367-2630/11/6/065004 Yoshino, K., Fujiwara, M., Tanaka, A., Takahashi, S., Nambu, Y., Tomita, A., … Tajima, A. (2012). High-speed wavelength-division multiplexing quantum key distribution system. Optics Letters, 37(2), 223. doi:10.1364/ol.37.000223 Mora, J., Ruiz-Alba, A., Amaya, W., Martínez, A., García-Muñoz, V., Calvo, D., & Capmany, J. (2012). Experimental demonstration of subcarrier multiplexed quantum key distribution system. Optics Letters, 37(11), 2031. doi:10.1364/ol.37.002031 Townsend, P. D. (1997). Simultaneous quantum cryptographic key distribution and conventional data transmission over installed fibre using wavelength-division multiplexing. Electronics Letters, 33(3), 188. doi:10.1049/el:19970147 Choi, I., Young, R. J., & Townsend, P. D. (2010). Quantum key distribution on a 10Gb/s WDM-PON. Optics Express, 18(9), 9600. doi:10.1364/oe.18.009600 Ortega, B., Mora, J., Puerto, G., & Capmany, J. (2007). Symmetric reconfigurable capacity assignment in a bidirectional DWDM access network. Optics Express, 15(25), 16781. doi:10.1364/oe.15.016781 Guerreau, O. L., Malassenet, F. J., McLaughlin, S. W., & Merolla, J.-M. (2005). Quantum key distribution without a single-photon source using a strong reference. IEEE Photonics Technology Letters, 17(8), 1755-1757. doi:10.1109/lpt.2005.851050 Capmany, J., & Fernandez-Pousa, C. R. (2011). Impact of Third-Order Intermodulation on the Performance of Subcarrier Multiplexed Quantum Key Distribution. Journal of Lightwave Technology, 29(20), 3061-3069. doi:10.1109/jlt.2011.2165526 Yuan, Z. L., Kardynal, B. E., Sharpe, A. W., & Shields, A. J. (2007). High speed single photon detection in the near infrared. Applied Physics Letters, 91(4), 041114. doi:10.1063/1.2760135

Simultaneous transmission of 20x2 WDM/SCM-QKD and 4 bidirectional classical channels over a PON

Abstract