Bo Guo, Xinyu Guo, Lige Tang, Wenlei Yang, Qiumei Chen, Zhongyao Ren. Ultra-long-period grating-based multi-wavelength ultrafast fiber laser [Invited][J]. Chinese Optics Letters, 2021, 19(7): 071405
- Chinese Optics Letters
- Vol. 19, Issue 7, 071405 (2021)
Fig. 1. Schematic diagram of the experimental setup for fabricating the ULPG sample. The green frame is the diagram of the ULPG sample and a micrograph of a fiber taper.
Fig. 2. Typical optical characteristics and saturable absorption property of the as-used ULPG: (a) transmission spectrum (inset: the photograph when the yellow light is passing out); (b) nonlinear saturable absorption behavior.
Fig. 3. Experimental setup. LD, laser diode; WDM, wavelength-division multiplexer; EDF, erbium-doped fiber; ISO, isolator; OC, optical coupler; SMF, single-mode fiber; PC, polarization controller; ULPG, ultra-long-period grating.
Fig. 4. Three-wavelength soliton mode-locking operation with a length of SMF of 93.5 m and a corresponding cavity dispersion of
Fig. 5. Four-wavelength soliton mode-locking operation with a length of SMF of 93.5 m and a corresponding cavity dispersion of
Fig. 6. Multi-wavelength mode-locking operation with a length of SMF of 93.5 m and a corresponding cavity dispersion of
Fig. 7. Seven-wavelength mode-locking operation with a length of SMF of 20 m and a corresponding cavity dispersion of
Fig. 8. Seven-wavelength and hybrid soliton operation with a length of SMF of 135 m and a corresponding cavity dispersion of
Fig. 9. Average output power versus the pump power of the laser with different lengths of SMF.
Fig. 10. Mode-locking principle of ULPG. CW, continuous wave.
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