Single-Mode Fiber Based Pulsed-Optical Timing Link with Few-Femtosecond Precision in SwissFEL

We present results from a pulsed-optical timing link using single-mode fiber components installed in SwissFEL. The system shows 2.6-fs RMS timing jitter in [1 MHz - 20 µHz] and presents a versatile alternative to polarization-maintaining version.