Abstract
We demonstrate a widely wavelength-tunable actively mode-locked fiber laser based on semiconductor optical amplifier. Beneficiating from the actively mode-locking operation and the wavelength-tunable characteristics of a Fabry–Perot filter, different harmonic mode-locking orders, from the fundamental mode-locking order (18.9 MHz) to the 520th order (9.832 GHz), can be easily achieved. The spectral bandwidth corresponding to the fundamental repetition rate is 0.12 nm with the pulse duration of 9.8 ns, leading to the TBP value of 146, which is about 460 times the transform-limited value for soliton pulse. The highest repetition rate of the mode-locked pulses we obtained is 9.832 GHz, with a signal-to-noise ratio up to 50 dB. The theoretical transform-limited pulse duration is 21 ps. Meanwhile, the central wavelength can be continuously tuned over 43.4 nm range (1522.8–1566.2 nm). The higher repetition rate and the widely tuning wavelength range make the fiber laser to own great potential and promising prospects in areas such as optical communication and photonic analog-to-digital conversion (ADC).
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 51275373), National High Technology Research and Development Program of China (Grant No. 2015AA0433505) and the Key Project of National Natural Science Foundation of Hubei Provincial Government (No. 2014CFA056).
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Mao, Y., Tong, X., Wang, Z. et al. Wavelength-tunable 10 GHz actively harmonic mode-locked fiber laser based on semiconductor optical amplifier. Appl. Phys. B 121, 517–521 (2015). https://doi.org/10.1007/s00340-015-6263-1
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DOI: https://doi.org/10.1007/s00340-015-6263-1