Publication:
Characterizations of multiwavelength brillouin fiber laser by utilizing semiconductor optical amplifier in single and double nonlinear optical loop mirror
Characterizations of multiwavelength brillouin fiber laser by utilizing semiconductor optical amplifier in single and double nonlinear optical loop mirror
Date
2021
Authors
Siti Noraini Che Abdul Jalil
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Abstract
This thesis demonstrated the research work on the multi-wavelength Brillouin fiber laser by utilizing semiconductor optical amplifier in single and double nonlinear optical loop mirror configuration. By exploiting the stimulated Brillouin scattering effect and the used of a semiconductor optical amplifier placed in the loop mirror able to increase the performance of the signals. It has the potential to amplify and increase the output
number of signals that pass through the fiber link, particularly in dense wavelength division multiplexing systems. The research begins with the investigation on two different of the gain medium used in the configuration such as single-mode fiber and dispersion compensating fiber. Meanwhile, the generation number of signals was analysed based on four different injection currents of semiconductor optical amplifier at 0.5 A, 0.6 A, 0.7 A and 0.8 A with different fiber lengths from 5 km to 15 km. Therefore, the results from the study indicate that utilizing dispersion compensating fiber at 13 km length with maximum semiconductor optical amplifier current at 0.7A generated more than 30 output signals. Henceforward, comparisons have been made by utilizing single-mode fiber to replace the dispersion compensating fiber in the loop mirror configurations. The use of dispersion compensating fiber at 6 km and 0.8A of maximum semiconductor optical amplifier current able to generate 11 output signals. The higher injection current of semiconductor optical amplifier at a shorter length of
single-mode fiber capable to generate more output number of signals. In conclusion, the parameter of different injections current at semiconductor optical amplifier and fiber length of the gain medium plays a vital role in producing the output number of signals. Next, the studies expanded into a double nonlinear optical loop mirror configuration whereby consists of two devices of semiconductor optical amplifier located in each loop mirrors. The 6km length of single-mode fiber also placed in the loop mirrors. Onward, the characterization based on the effect of injected Brillouin pump power into configurations with a different range from -12 dBm until 12 dBm was demonstrated. The comparison had been made between single and double nonlinear optical loop mirrors. As a result, the double loop mirror able to provide more output number of signals when utilized low level of input Brillouin pump power at -8 dBm. The average optical signal to noise ratio was recorded at ~26 dB by utilizing lower input Brillouin pump power at -11 dBm. Meanwhile, the single nonlinear optical loop mirrors configurations able to produce more output number of signals at high input Brillouin pump power. At 5 dBm, 6 dBm and 7 dBm of input Brillouin pump power, can produce an 11 output number of signals, respectively. Therefore, the higher average of the optical signal to noise ratio was observed at ~22.2 dB by utilizing 8 dBm of input Brillouin pump power. The result can be seen clearly at the end of the thesis whereby
utilizing a semiconductor optical amplifier to generated multi-wavelength signals able to increase the performance of the fiber laser system. Furthermore, the nonlinear effects involve in the configuration also play an important role in fiber laser system.
Description
Master of Science in Engineering Photonic
Keywords
Multi-Wavelength Brillouin Fiber,
Laser,
Optical amplifier,
Optical Loop Mirror