Abstract
A numerical analysis is presented on the long-haul wavelength-division multiplexing (WDM) transmission system employing fiber-optic parametric amplifier (FOPA) cascades based on one-pump FOPA model with Raman Effect taken into account. The end-to-end equalization scheme is applied to optimize the system features in terms of proper output powers and signal-to-noise ratios (SNRs) in all the channels. The numerical results show that—through adjusting the fiber spans along with the number of FOPAs as well as the channel powers at the terminals in a prescribed way—the transmission distance and system performance can be optimized. By comparing the results generated by different lengths of fiber span, we come to the optimal span length to achieve the best transmission performance. Furthermore, we make a comparison among the long-haul WDM transmission systems employing different inline amplifiers, namely, FOPA, erbium-doped fiber amplifier (EDFA), and Fiber Raman Amplifier (FRA). FOPA demonstrates its advantage over the other two in terms of system features.
Highlights
In recent years, Fiber-optical parametric amplifiers (FOPAs) are attracting widespread interest among researchers in fiberoptic field because of efficient broadband amplification [1] and wavelength conversion [2]
The mathematical model of one-pump FOPA with Raman Effect is developed in Section 2.1, while Section 2.2 designs and numerically calculates a long-haul wavelength-division multiplexing (WDM) transmission system employing cascaded FOPAs, using end-to-end equalization, and based on different lengths of fiber span
We find that signalto-noise ratios (SNRs) in each channel decreases monotonously with fiber span length
Summary
Fiber-optical parametric amplifiers (FOPAs) are attracting widespread interest among researchers in fiberoptic field because of efficient broadband amplification [1] and wavelength conversion [2]. They are candidates for performing all-optical networking functions [3, 4]. It was reported that the noise figure of a phase-insensitive parametric amplifier exceeds that of an ideal phase-insensitive amplifier by 3 dB [7] Another major problem in implementing amplified WDM transmission systems is “gain equalization.”. WDM transmission system using end-to-end equalization is designed, analyzed, and optimized
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