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Figure 4. FWM conversion efficiency dependence on frequency separation for Conv. DSF and HNL-DSF (Pp = 100 mW; P s= 0,5 mW).

Figure 4 FWM conversion efficiency dependence on frequency separation for Conv. DSF and HNL-DSF (Pp = 100 mW; P s= 0,5 mW).

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Figure I. Schematic representation of fiber FWM and measured optical spectra at the output of Non-Zero Dispersion Shifted Fiber (NZDSF). The work reported in this paper was supported by the Slovenian Ministry of Education, Science and Sport - project “Algorithms and Optimizations in Telecommunications”.
Figure I. Schematic representation of fiber FWM and measured optical spectra at the output of Non-Zero Dispersion Shifted Fiber (NZDSF). The work reported in this paper was supported by the Slovenian Ministry of Education, Science and Sport - project “Algorithms and Optimizations in Telecommunications”.
Last part of equation (3) represents FWM efficiency, which can be expressed as
Last part of equation (3) represents FWM efficiency, which can be expressed as
Figure 3. Schematic representation of the fiber WC based on FWM and output optical spectra. A conventional WC scheme based on FWM is shown in Fig. 3. Input powers are P; and P, for the signal and pump lights at wavelength 4, and 4,. The two lights are commonly amplified by an Erbium-Doped Fiber Amplifier (EDFA) and are input to the fiber line, where they mix with each other. The mixing in this case is degenerate FWM, because two of the frequencies in FWM process are the same. Output signal from the fiber goes through bandpass filter, where pump, input signal and satellite signal are eliminated.
Figure 3. Schematic representation of the fiber WC based on FWM and output optical spectra. A conventional WC scheme based on FWM is shown in Fig. 3. Input powers are P; and P, for the signal and pump lights at wavelength 4, and 4,. The two lights are commonly amplified by an Erbium-Doped Fiber Amplifier (EDFA) and are input to the fiber line, where they mix with each other. The mixing in this case is degenerate FWM, because two of the frequencies in FWM process are the same. Output signal from the fiber goes through bandpass filter, where pump, input signal and satellite signal are eliminated.
Out of non-interferometric techniques FWM is very reliable for determining fiber NLC. The well-known measuring setup [24]-[26] based on FWM is made up of two DFB lasers, where the wavelength spacing is adjusted by temperature tuning. It uses more than one EDFA to raise the total optical power. One of the biggest disadvantages of this method is that the polarisation controllers (PC) must be adjusted to each other all the measurement time in order to obtain the maximum FWM efficiency. The determination of fiber NLC employing such FWM measurement setup has a limited measurement capability due to the polarisation adjustment and insufficient amplification.
Out of non-interferometric techniques FWM is very reliable for determining fiber NLC. The well-known measuring setup [24]-[26] based on FWM is made up of two DFB lasers, where the wavelength spacing is adjusted by temperature tuning. It uses more than one EDFA to raise the total optical power. One of the biggest disadvantages of this method is that the polarisation controllers (PC) must be adjusted to each other all the measurement time in order to obtain the maximum FWM efficiency. The determination of fiber NLC employing such FWM measurement setup has a limited measurement capability due to the polarisation adjustment and insufficient amplification.
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