Search results for: M. Z. Zulkifli

Items from 1 to 8 out of 8 results

article

Switchable dual-wavelength CNT-based Q-switched using arrayed waveguide gratings (AWG)

H. Ahmad, K. Z. Hamdan, F. D. Muhammad, S. W. Harun, more

Applied Physics B > 2015 > 118 > 2 > 269-274

In this paper, a dual-wavelength synchronously pulsed fiber laser Q-switched by carbon nanotube-based saturable absorber with switchable wavelength spacing enabled using arrayed waveguide grating (AWG) is proposed and demonstrated. By just switching the channels of the AWG, discrete tuning in wavelength spacing of the dual-wavelength Q-switched laser operation can be attained over several nanometers,...

article

Mode-locked L-band bismuth–erbium fiber laser using carbon nanotubes

H. Ahmad, A. Z. Zulkifli, F. D. Muhammad, M. Z. Zulkifli, more

Applied Physics B > 2014 > 115 > 3 > 407-412

A passively mode-locked, bismuth–erbium-co-doped fiber (Bi-EDF) with a pulse width of 460 fs is proposed and demonstrated. A highly doped, 180-cm Bi-EDF with an erbium concentration of 3,250 ppm/wt and an absorption rate of 133 dB/m at 1,530 nm serves as the gain medium. The cavity is 11.6 m long with an overall group velocity dispersion of +0.063 ps². The output pulses have a repetition rate, average...

article

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

H. Ahmad, F. D. Muhammad, M. Z. Zulkifli, S. W. Harun

IEEE Photonics Journal > 2013 > 5 > 5 > 1501709

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...

article

Narrow Spacing Dual-Wavelength Fiber Laser Based on Polarization Dependent Loss Control

H. Ahmad, M. R. K. Soltanian, C. H. Pua, M. Z. Zulkifli, more

IEEE Photonics Journal > 2013 > 5 > 6 > 1502706

By controlling the polarization state of a simple ring erbium-doped fiber laser with photonics crystal fiber, polarization controller (PC) and tunable band-pass filter, this paper demonstrates stable operation of narrow spacing dual-wavelength fiber laser (DWFL). The flexibility of the tunable band-pass filter and PC allows the spacing tuning of the DWFL from 80 pm up to 600 pm. Such tuning ability...

article

S + C + L Band tunable wavelength conversion using FWM dual‐wavelength fiber laser in a highly nonlinear fiber

Noor Azura Awang, Amirah Abdul Latif, M. Z. Zulkifli, Zawajer A. Ghani, more

Microwave and Optical Technology Letters > 55 > 2 > 379 - 382

In this article, a novel wideband wavelength conversion is demonstrated using a highly nonlinear fiber consisting of a fluorine‐doped fiber that has a high delta core and surrounded by a deeply depressed ring as opposed to the use of photonic crystal fibers.The wavelength conversion range is from 1460 to 1640 nm, which covers the S‐, C‐ and L‐bands of the optical network. The interacting waves consist...

chapter

Graphene nano-, micro- and macro-photonics

R. M. De La Rue, H. Ahmad, S. Wadi Harun, W. Chong, more

2012 14th International Conference on Transparent Optical Networks (ICTON) > 1 - 4

2012 14th International Conference on Transparent Optical Networks (ICTON)

Graphene has already become an established medium for novel photonic devices and their applications. In some cases, e.g. the use of graphene as a non-linear medium with saturable absorption properties, it is experimentally convenient to use the readily available form that is known as graphene oxide. Moreover, technological and scientific developments that are advancing control of the properties of...

article

Graphene-Based Saturable Absorber for Single-Longitudinal-Mode Operation of Highly Doped Erbium-Doped Fiber Laser

F. D. Muhammad, M. Z. Zulkifli, A. A. Latif, S. W. Harun, more

IEEE Photonics Journal > 2012 > 4 > 2 > 467 - 475

In this paper, a conventional wavelength band (C-band) fiber laser with a tunable single-longitudinal-mode (SLM) output using multilayer graphene as a saturable absorber is demonstrated. The proposed fiber laser uses a short length of highly doped erbium-doped fiber (EDF) as the gain medium and a fiber ferrule with graphene flakes adhered to it by index matching gel (IMG) that acts as the saturable...

article

Graphene-Oxide-Based Saturable Absorber for All-Fiber Q-Switching With a Simple Optical Deposition Technique

H. Ahmad, F. D. Muhammad, M. Z. Zulkifli, S. W. Harun

IEEE Photonics Journal > 2012 > 4 > 6 > 2205 - 2213

A Q-switched erbium-doped fiber laser (EDFL) incorporating a graphene-oxide-based saturable absorber (SA) is proposed and demonstrated. The SA is fabricated by first dissolving graphene oxide nanopowder in water and subsequently using the thermophoresis effect to deposit it onto the fiber ferrule. The SA is integrated into a ring cavity EDFL, which uses a 3-m-long MetroGain Type-12 erbium-doped fiber...

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