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Author Ummy, Muhammad Ali
Title Gain characterization of a hybrid Raman/parametric amplifier and phase characterization of a semiconductor optical amplifier
book jacket
Descript 115 p
Note Source: Dissertation Abstracts International, Volume: 69-01, Section: B, page: 0573
Advisers: Mumtaz Kassir; Roger Dorsinville
Thesis (Ph.D.)--City University of New York, 2008
We have investigated two different nonlinear processes in a distributed medium, such as, a highly non-linear fiber (HNLF) and have demonstrated that by combining optical fiber parametric amplification with Raman fiber amplification, we could further extend the flat gain bandwidth of a Raman fiber amplifier. The parametric process enabled an increase in gain bandwidth by extending the gain region to the longer wavelength side of the Raman gain. Two different configurations of the amplifier were investigated, and their gains and bit error performances were characterized. A gain of about 14-15 dB, with a gain flatness of 5-6 dB was observed in both configurations. In the Raman gain region (1545nm-1570nm) there was a negligible power penalty for both configurations, whereas a 1dB to 3dB power penalty is observed in the parametric gain region (1575nm to 1590nm)
We have also demonstrated an experimental methodology to characterize the nonlinear phase of a semiconductor optical amplifier (SOA) as a function of input intensity. The experimental setup was based on an asymmetric Sagnac interferometer and was carried out at three different gain levels by setting the drive current of the SOA to 170mA, 190mA and 200mA At low input power it was noticed that the signal experienced very small phase change, irrespective of the gain setting of the SOA. However, as the power increased the phase curves began to diverge. It was observed that for values of the input signal power beyond 0.001 W, the slopes of the curves became steeper as the gain of the SOA increased This implied that in order to achieve a large phase shift at low input signal power, the gain level of the SOA must be set to a higher value
School code: 0046
DDC
Host Item Dissertation Abstracts International 69-01B
Subject Engineering, Electronics and Electrical
0544
Alt Author City University of New York. Engineering
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