Wavelength-Tunable Burst-Mode Pulse With Controllable Pulse Numbers and Pulse Intervals

We propose and demonstrate generation of wavelength-tunable burst-mode pulses with controllable pulse numbers and pulse intervals based on the pulse repetition rate multiplication technique. A topological insulator and nonlinear polarization evolution (NPE) hybrid mode-locking Er-doped fiber oscillator is used to provide a stable wavelength-tunable mode-locked (WTML) pulse. This pulse is transformed into a burst-mode pulse using the pulse repetition rate multiplication technique. Wavelength tunability is realized by using the NPE device, which can serve as a filter as well as a mode locker by adjusting the polarization controllers. The central wavelength of the burst-mode pulse can be tuned from 1533.49 to 1561.99 nm. Changing the arm length difference in each of the couplers as well as the number of 3-dB couplers, N, allows control of the intraburst pulse spacing and the number of pulses in each burst. Our results demonstrate that the combination of a WTML pulse laser and the pulse repetition rate multiplication technique may indeed be an effective and flexible way to achieve WTML burst-mode soliton pulses.