A novel synchronization method for WR system

White Rabbit precision time protocol (WR-PTP) implements sub-nanosecond synchronization of equipment in the fiber network within the range of 10km. For real applications, it needs additional auxiliary fiber link to calibration the asymmetry of the fiber link, because of the different wavelength of the uplink and downlink light. By implement only one wavelength light for both directions, we greatly simplified the calibration process and get one order time higher synchronization precision than the previous method. Without complex recalibration for each link, the new method would make the WR system much easier to be applied.