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Graphene-Based Mode-Locked Spectrum-Tunable Fiber Laser Using Mach–Zehnder Filter

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4 Author(s)
Ahmad, H. ; Dept. of Phys., Univ. of Malaya, Kuala Lumpur, Malaysia ; Muhammad, F.D. ; Zulkifli, M.Z. ; Harun, S.W.

An ultrafast spectrum-tunable fiber laser using a tunable Mach-Zehnder filter (TMZF) and a graphene-based saturable absorber as a mode-locking element is proposed and demonstrated. The proposed laser uses a 2-m-long zirconia-erbium-doped fiber (Zr-EDF) as the primary gain medium. The Zr-EDF has a dopant concentration of 3800 ppm/wt and an absorption rate of 18.3 dB/m at 980 nm. The proposed laser is able to generate mode-locked solitons, with the central wavelength of the spectrum tunable from 1551 to 1570 nm and covering a wavelength range of about 19 nm. Sidebands are observed with 3-dB bandwidths and pulsewidths of between 3.4 and 3.6 nm and from 730 to 780 fs, respectively, as well as a time-bandwidth product between 0.32 and 0.33. The generated pulse yields an average output power value of ~ 1.4 mW, pulse energy of ~ 128 pJ, and repetition rate of ~ 10.9 MHz. This is the first time, to the knowledge of the authors, that a graphene-based mode-locked spectrum-tunable fiber laser is demonstrated using a TMZF.

Output spectra of the mode locked pulses at 13 different central wavelengths with conserved Kelly sidebands structures. Output spectra of the mode locked pulses at 13 different central wavelengths with conserved Kelly sidebands structures.

Published in:

Photonics Journal, IEEE  (Volume:5 ,  Issue: 5 )