We present a passively mode-locked Erbium-doped fiber laser with tunable parameters including central wavelength, 3-dB bandwidth, and pulse duration. The mode-locking mechanism of the laser is realized by using single-walled carbon nanotubes (SWCNTs) polyvinyl alcohol composite film as a saturable absorber. The tunable operation is implemented via a fiber birefringence filter consisting of a polarization maintaining (PM) fiber and a Brewster fiber grating. The laser achieves a maximum spectral tuning range of 36 nm with 8-cm PM fiber. The maximum spectral width variation of 5.19 nm is acquired when the PM fiber is 12 cm. Simultaneously, the spectral widths of pulses at different central wavelengths are also adjustable. Furthermore, the total cavity length is 8.28 m, which is the shortest cavity length to obtain such wide tuning range in an Erbium-doped fiber laser based on SWCNTs.
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Funding: This work was supported by the National
Natural Science Foundation of China (NSFC) (61605107,61505244), the
project was supported by Open Fund of IPOC2017B010 (BUPT), the Open
Fund of Key Laboratory of Opto-electronic Information Technology, Ministry
of Education (Tianjin University, China) (2018KFKT009), Young Eastern
Scholar Program at Shanghai Institutions of Higher Learning (QD2015027);
“Young 1000 Talent Plan” Program of China , RAEng and the Leverhulme
Trust Senior Research Fellowships (LTSRF1617/13/57), Marie SklodowaskCurie IEF project (H2020-MSCA-IF-2014_ST, Proposal#: 656984); MarieCurie Inter-national Research Staff Exchange Scheme ‘‘TelaSens’’ project,
Research Executive Agency Grant No. 269271,Programme: FP7-PEOPLE2010-IRSES and support from the Ministry of Higher Education, Sultanate of
- Passively mode-locked fiber laser
- pulse width
- spectral width
- tilted fiber grating