Abstract
A new approach to suppressing the four-wave mixing (FWM) crosstalk by using the pairing combinations of differently linear-polarized optical signals was investigated. The simulation was conducted using a four-channel system, and the total data rate was 40 Gb/s. A comparative study on the suppression of FWM for existing and suggested techniques was conducted by varying the input power from 2 dBm to 14 dBm. The robustness of the proposed technique was examined with two types of optical fiber, namely, single-mode fiber (SMF) and dispersion-shifted fiber (DSF). The FWM power drastically reduced to less than −68 and −25 dBm at an input power of 14 dBm, when the polarization technique was conducted for SMF and DSF, respectively. With the conventional method, the FWM powers were, respectively, −56 and −20 dBm. The system performance greatly improved with the proposed polarization approach, where the bit error rates (BERs) at the first channel were 2.57 × 10−40 and 3.47 × 10−29 at received powers of −4.90 and −13.84 dBm for SMF and DSF, respectively.
Highlights
Four-wave mixing (FWM) is one of the phenomena that may lower the effectiveness of the transmitted signal in wavelength division multiplexing (WDM) systems under dense channel spacing and low chromatic dispersion
The proposed polarization technique was compared with the conventional method and examined with single-mode fiber (SMF) and dispersion-shifted fiber (DSF)
We propose an efficient approach for reducing the transmission limitation caused by the FWM in a WDM
Summary
Four-wave mixing (FWM) is one of the phenomena that may lower the effectiveness of the transmitted signal in wavelength division multiplexing (WDM) systems under dense channel spacing and low chromatic dispersion. Few reports and methods have been proposed for solving the problems associated with FWM The examples of such methods are the use of nonzero dispersion fibers, relatively low channel counts, and unequal channel spacing techniques [4,5,6]. As the channel count increases, more channels have to be confined to the erbium-doped fiber amplifier gain band by reducing the channel spacing This condition increases the FWM effects and has a negative effect on the FWM suppression methods. The proposed technique was investigated in both single-mode fiber (SMF) and dispersion-shifted fiber (DSF) with a 70 km fiber length and four channels Through this approach, the FWM crosstalk significantly reduced and a good improvement was observed in system performance. The results confirm the robustness of the polarization technique against the FWM crosstalk and show that the FWM crosstalk has no dangerous influence on the system performance, even at a high value of input power
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