| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Generation of Q-Switched Mode-Locked Erbium-Doped Fiber Laser Operating in Dark Regime |
| Zian Cheak Tiu1**, Arman Zarei1, Harith Ahmad1, Sulaiman Wadi Harun2 |
1Photonics Research Center, University of Malaya, Kuala Lumpur 50603, Malaysia
2Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
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| Cite this article: |
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Zian Cheak Tiu, Arman Zarei, Harith Ahmad et al 2016 Chin. Phys. Lett. 33 034201 |
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Abstract We demonstrate a stable Q-switched mode-locked erbium-doped fiber laser (EDFL) operating in dark regime based on the nonlinear polarization rotation technique. The EDFL produces a pulse train where the Q-switching envelope is formed by multiple dark pulses. The repetition rate of the Q-switched envelope can be increased from 0.96 kHz to 3.26 kHz, whereas the pulse width reduces from 211 μs to 86 μs. The highest pulse of 479 nJ is obtained at the pump power of 55 mW. It is also observed that the dark pulses inside the Q-switching envelope consist of two parts: square and trailing dark pulses. The shortest pulse width of the dark square pulse is obtained at 40.5 μs when the pump power is fixed at 145 mW. The repetition rate of trailing dark pulses can be increased from 27.62 kHz to 50 kHz as the pump power increases from 55 mW to 145 mW.
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Received: 30 October 2015
Published: 31 March 2016
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| PACS: |
42.60.Fc
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(Modulation, tuning, and mode locking)
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42.65.Re
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(Ultrafast processes; optical pulse generation and pulse compression)
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42.65.Tg
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(Optical solitons; nonlinear guided waves)
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Abstract
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