Zolelwa Billie | University of Johannesburg, South Africa (original) (raw)
Address: Johannesburg, Gauteng, South Africa
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Arab Academy for Science, Technology, and Maritime Transport
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Papers by Zolelwa Billie
A simple multi-wavelength laser source using, an erbium doped fiber (EDF) as a gain medium is pro... more A simple multi-wavelength laser source using, an erbium doped fiber (EDF) as a gain medium is proposed. The source is terminated by a chirped fiber Bragg grating (CFBG) on one side and cascaded FBGs on the other side. Different apodization profiles for the FBG are analyzed to improve the lasing wavelengths selectivity. The Blackman profile is found to be the best to reduce the reflection spectrum sidelobes with a maximum reflectivity of 99%.
In terrestrial optical communications, optical fiber transmission links are vital for both short ... more In terrestrial optical communications, optical fiber transmission links are vital for both short and long distances networks. This is due to their high bandwidth capability that translates into high speed data transmission. However, trench digging to lay the optical fiber cables makes their installation intricate and time consuming compared to optical wireless transmission. Meanwhile, Free Space Optical communication (FSO) links often employed in short distance, line of sight optical wireless transmission present competitive data rates if their bandwidth is maximized. We have considered using the Wavelength Division Multiplexing (WDM) technique in the development of a FSO link prototype to increase the capacity of the link. Currently, most FSO links use single wavelength Laser Diodes (LD) in their transmitters. We propose the design of a multiwavelength Erbium doped fiber laser (EDFL) source, to avoid the use of multiple LD in the prototype. In this paper, an EDFL source with emission wavelengths at 1540nm, 1547nm and 1555nm is presented. Characteristics of the Laser source such as output optical power and laser wavelengths are controlled by optimizing the laser parameters such as length of the gain medium, coupling ratio of the output mirrors and the laser pump power.
A simple multi-wavelength laser source using, an erbium doped fiber (EDF) as a gain medium is pro... more A simple multi-wavelength laser source using, an erbium doped fiber (EDF) as a gain medium is proposed. The source is terminated by a chirped fiber Bragg grating (CFBG) on one side and cascaded FBGs on the other side. Different apodization profiles for the FBG are analyzed to improve the lasing wavelengths selectivity. The Blackman profile is found to be the best to reduce the reflection spectrum sidelobes with a maximum reflectivity of 99%.
In terrestrial optical communications, optical fiber transmission links are vital for both short ... more In terrestrial optical communications, optical fiber transmission links are vital for both short and long distances networks. This is due to their high bandwidth capability that translates into high speed data transmission. However, trench digging to lay the optical fiber cables makes their installation intricate and time consuming compared to optical wireless transmission. Meanwhile, Free Space Optical communication (FSO) links often employed in short distance, line of sight optical wireless transmission present competitive data rates if their bandwidth is maximized. We have considered using the Wavelength Division Multiplexing (WDM) technique in the development of a FSO link prototype to increase the capacity of the link. Currently, most FSO links use single wavelength Laser Diodes (LD) in their transmitters. We propose the design of a multiwavelength Erbium doped fiber laser (EDFL) source, to avoid the use of multiple LD in the prototype. In this paper, an EDFL source with emission wavelengths at 1540nm, 1547nm and 1555nm is presented. Characteristics of the Laser source such as output optical power and laser wavelengths are controlled by optimizing the laser parameters such as length of the gain medium, coupling ratio of the output mirrors and the laser pump power.