Chinese Optics Letters, 2014, 12 (11): 113202, Published Online: Oct. 31, 2014   

Dark pulse emission in nonlinear polarization rotation-based multiwavelength mode-locked erbium-doped fiber laser Download: 752次

Author Affiliations
1 Department of Electrical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
2 Photonics Research Center, University of Malaya, 50603 Kuala Lumpur, Malaysia
3 School of Engineering, KDU University College, SS22/41, Damansara Jaya, 47400 Petaling Jaya, Selangor Darul Ehsan, Malaysia
Abstract
We experimentally show dark pulse generation in all-normal dispersion multiwavelength erbium-doped fiber laser (EDFL) with a long cavity of figure-of-eight configuration. The EDFL generates a stable multiwavelength laser with 0.47 nm spacing at 24 mW threshold pump power, while the number of lines obtained increases with the pump power. A dark pulse emission is observed as the pump power is increased above 137 mW, with fundamental repetition rate of 29 kHz and pulse width of 2.7 μs. It is observed that the dark pulse train can be shifted to second-, third-, and fourth-order harmonic dark pulses by carefully adjusting the polarization controller. For the fundamental dark pulse, the maximum pulse energy of 32.4 nJ is obtained at pump power of 146.0 mW.

Zian Cheak, Sin Jin, Harith Ahmad, Sulaiman Wadi. Dark pulse emission in nonlinear polarization rotation-based multiwavelength mode-locked erbium-doped fiber laser[J]. Chinese Optics Letters, 2014, 12(11): 113202.

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