公开(公告)号：EP2101441A1

公开(公告)日：2009-09-16

申请号：EP08394008.0

申请日：2008-03-13

申请人： University College Cork-National University of Ireland, Cork

发明人： Townsend, Paul David ,  Choi, Iris Pui Suen

IPC分类号： H04L9/08

CPC分类号： H04L9/0852

摘要： The invention provides time-synchronised transmission of data on the (polarisation or phase-modulated) QKD channel and the (on-off modulated) conventional channel such that a QKD bit is only transmitted when a zero, or sequence of zeros, is transmitted on the conventional channel. Also, there is co-directional propagation of the QKD and conventional channel. Further, there is dispersion management through wavelength selection or control of fibre properties or other means such that the 'walk-off' in time of the QKD pulses and the Raman pulses generated by the ones on the conventional channel is less than or of the order of one bit period. The latter can be achieved, for example, by placing the conventional and QKD channel wavelengths close to the point where the group velocity-induced time delay for optical pulses propagating in the fibre reaches a minimum. This dispersion minimum occurs at a wavelength of 1.3microns in standard fibre.

摘要翻译： 本发明提供了在（偏振或相位调制）QKD信道和（开 - 关调制的）常规信道上的数据的时间同步传输，使得仅在零或零序列被发送时才发送QKD位 常规渠道。 此外，还存在QKD和常规信道的共向传播。 此外，通过波长选择或光纤特性的控制或其他方式进行色散管理，使得在QKD脉冲的时间上的“脱离”和由常规通道上产生的拉曼脉冲小于或等于 一段时间。 后者可以例如通过将常规和QKD信道波长放置在接近在光纤中传播的光脉冲的组速度引起的时间延迟达到最小的点。 该分散体的最小值在标准纤维中以1.3微米的波长发生。