Fig. 1. (a) Experimental setup. APD, avalanche photodiode; CIR, circulator at 1550 nm; EDF, Er-doped fiber; FC/APC, FC/APC connectors; FDL, electrically controlled fiber delay line; HNLF, highly nonlinear fiber; , homemade -to- interferometer; LD, 976 nm laser diode; PD, fiber-coupled photodiode; PLL, phase-locked loop system; PZT, piezoelectric transducer; SESAM, packaged semiconductor saturable absorber mirror; WDM, 980/1550 nm wavelength division multiplexer. (b) The photograph and movie (Visualization 1) of the ‘optics package’ and one package of the PLLs .

Fig. 2. (a) The optical spectrum of the oscillator. (b) Measured RF spectrum of the repetition rate (300 kHz resolution). (c) The tunable repetition rates with FDL modulations (10 Hz resolution). (d) Long-term output power of the oscillator above 12 h and the stability test (Visualization 2). (e) The original amplitude noise (blue line) and the integral amplitude noise (green line) from the oscillator. (f) The pulse duration of the compressed pulse after the amplifier.

Fig. 3. (a) The supercontinuum after HNLF with the compressed pulses. (b) The RF spectrum of the frequency detected by the APD.

Fig. 4. (a) The recorded time series of the offset. (b) The counts of the offset. (c) The overlapping Allan deviation of the recorded . (d) The recorded time series of the offset. (e) The counts of the offset. (f) The overlapping Allan deviation of the recorded .

Fig. 5. (a) The noise characterization of . The phase noise of stabilized with the pump current (blue line), the integrated phase noise of the stabilized with the pump current (green line) and the introduced -separation line (orange line). (b) The noise characterization of . The phase noise of stabilized with the PZT (blue line) and the integrated phase noise of stabilized with the PZT (green line).