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The goal of this research was to compare the performance of single-pump FOPAs and LRAs in exactly the same operating conditions, aiming to determine which of these two amplifier types generates less signal impairments.
The most promising alternative to EDFAs are the two types of optical amplifiers that utilize fiber non-linearity for all optical signal amplification purposes: Raman amplifiers (RA) and fiber optical parametric amplifiers (FOPA).
At the end of this fiber the signal is amplified by one of the two discrete amplifiers: the single pump FOPA (Fig.
To reach the goal of this research the simulation model of a WDM system with a dual-pump FOPA preamplifier was introduced.
The use of the attenuator was required to exclude the impact of state of polarization changes of the signal in the SMF on the performance of the FOPA, which could lead to misinterpretation of the obtained results.
After being sent through the attenuator the optical flow enters a dual-pump FOPA. The FOPA consisted of 2 powerful optical sources, the output radiation of which was phase modulated by the following 4 frequency tones in order to mitigate SBS: 0.18 GHz, 0.42 GHz, 1.087 GHz and 2.133 GHz.
In systems where FOPAs are used for wavelength conversion and all-optical signal regeneration such spectral broadening of the idler components is not acceptable as it will cause severe power penalty at the receiver end.
Due to the facts mentioned above, recently a lot of attention has been focused on implementation of alternative types of optical amplifiers in optical transmission systems, especially to fiber optical parametric amplifiers (FOPA).
The main goal of this article is to investigate the performance of a lumped single pump in-line FOPA in an 8 channel DWDM transmission system.
Experimental results were obtained by introducing a simulation model of a system with the in-line single pump FOPA. For this purpose OptSim 5.2 was used, because this mathematical tool allows obtaining high accuracy results without acquiring high requirements to the hardware.
In most of the recent papers on FOPAs the first two of them are considered without correlation to the third one and vice versa [4,5,6,9].
1 shows a 4-channel system with 10 Gbit/s per channel data rate and one lumped FOPA. The frequencies of channel carriers are ITU-T standardized 196.9, 197, 197.1 and 197.2 THz, which corresponds to wavelengths in the S-band.