Dunya Zeki Mohammed

Gilgamesh University

The development of optical networks in the telecommunications sector is becoming much closer by considering the help of an Optical Add Drop Multiplexer (OADM) based on a novel technology called Wavelength Division Multiplexing (DWDM). The objective of the current study to examine high transmission bit rates for next-generation optical communication...

In this work, compact praseodymium-doped fiber amplifiers (PDFAs) with single- and dual-pass configurations are designed and investigated in the O-band region based on theoretical simulation. The impact of doped fiber characteristics, input signal power and input pumping power on the gain and the noise figure of the proposed amplifiers are comprehe...

In this paper, the performance of single and double-pass thulium-doped fiber amplifiers (SD-TDFA and DP-TDFA) is analyzed in the short wavelength (S-band) region. The effect of thulium-doped fiber (TDF) length, input signal power, and input pumping power on the amplifier’s performance is comprehensively investigated on basis of gain and noise figur...

A passively Q-switched Er-doped fiber laser (EDFL) with ring cavity operating at 1568.6 nm was demonstrated using a saturable absorber (SA) based on double walled carbon nanotubes (DWCNTs) film, which was prepared using polyvinyl alcohol (PVA) as a host polymer. The Q-switching operation was achieved at a low pump threshold of 40 mW. The proposed f...

In this work, single- and double-pass configurations of ytterbium-doped optical fiber amplifiers (YDFAs) have been investigated. This low quantum defect rare-earth dopant and their performance near 1 µm region has been comprehensively investigated on the basis of gain and noise figure in relation with input signal power and input pump power. The ob...

We demonstrated a Q-switched erbium-doped fiber laser (EDFL) based on large diameter coreless fiber without intra-cavity tuning element for the first time. A single mode fiber –coreless fiber –single mode fiber (SNCFS) structure was employed as a passive Q-switcher relies on Kerr nonlinearity associated with multi-mode interference (MMI) effect. By...

We report on aluminum oxide nanoparticles ( Al 2 O 3 NPs) as a saturable absorber (SA) for passively Q -switched erbium-doped fiber laser (EDFL) operating at a wavelength of 1560.6 nm within the C-band region. A thin film of Al 2 O 3 -SA was prepared using polyvinyl alcohol (PVA) as a host polymer. Very stable pulses with a 57.8 KHz repetition rate...

The stability of Q-switched erbium-doped fiber laser using double and multi -walled carbon nanotubes (DWCNTs and MWCNTs) saturable absorbers (SAs) has been investigated. DWCNTs SA showed better stability than MWCNTs SA at the proposed concentration.

A passively Q-switched Er-doped fiber laser with a ring cavity operating at 1568.6 nm is demonstrated using a saturable absorber based on a double walled carbon nanotubes film, which is prepared using polyvinyl alcohol as a host polymer. The Q-switching operation is achieved at a low pump threshold of 40 mW. The proposed fiber laser produces stable...