Fig 8 - uploaded by Stephan Pachnicke
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Pre-FEC BERs employing different equalizers for simulation 2. Inset: BERs at the second full collision around the SD-FEC threshold.
Source publication
We investigate the transmission of densely multiplexed solitons using a photonic integrated chip and the nonlinear Fourier-transform and analyze required launch conditions, the effect of (de-)multiplexing and noise on the nonlinear spectrum, and equalization techniques that can be used to enhance the transmission performance.
Contexts in source publication
Context 1
... the next step, equalizers were used to improve the results for simulations 2 and 3. Fig. 8 shows the resulting BERs after using the aforementioned equalizer approaches for simulation 2. In order to ensure enough training data, all equalizers (MMSE and NN) were trained using 10,000 training solitons. Here, all MMSE equalizers using the correlations between eigenvalue deviations and their respective NFT coefficients are highly ...
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... the aforementioned equalizer approaches for simulation 2. In order to ensure enough training data, all equalizers (MMSE and NN) were trained using 10,000 training solitons. Here, all MMSE equalizers using the correlations between eigenvalue deviations and their respective NFT coefficients are highly effective. The multi-channel MMSE ("Multi" in Fig. 8), which also accounts for cross-correlations between solitons of the same transmitted 4-soliton group, is able to further improve the results of the MMSE which equalizes only one channel at a time ("Single"). This particularly applies to transmission distances up to 1800 km, i.e., before the second complete collision that also involves ...
Context 3
... groups occurs at ~2000 km (see Fig. 6), MMSE approaches are less effective in compensating the deviations induced by this collision. To improve on the performance of the "Multi" MMSE, the solitons of the neighboring symbol groups, that have been launched right before or after the analyzed group, can also be taken into account ("Neighbors" in Fig. 8), since pulses from these launch windows are also involved in the collision and play a role in the range 1850 -2450 km. However, resulting further improvements are rather small. The MMSE equalizers manage to keep the BER below the SD-FEC limit of 2.2e-2 up to 2700 ...
Context 4
... the next step, equalizers were used to improve the results for simulations 2 and 3. Fig. 8 shows the resulting BERs after using the aforementioned equalizer approaches for simulation 2. In order to ensure enough training data, all equalizers (MMSE and NN) were trained using 10,000 training solitons. Here, all MMSE equalizers using the correlations between eigenvalue deviations and their respective NFT coefficients are highly ...
Context 5
... the aforementioned equalizer approaches for simulation 2. In order to ensure enough training data, all equalizers (MMSE and NN) were trained using 10,000 training solitons. Here, all MMSE equalizers using the correlations between eigenvalue deviations and their respective NFT coefficients are highly effective. The multi-channel MMSE ("Multi" in Fig. 8), which also accounts for cross-correlations between solitons of the same transmitted 4-soliton group, is able to further improve the results of the MMSE which equalizes only one channel at a time ("Single"). This particularly applies to transmission distances up to 1800 km, i.e., before the second complete collision that also involves ...
Context 6
... groups occurs at ~2000 km (see Fig. 6), MMSE approaches are less effective in compensating the deviations induced by this collision. To improve on the performance of the "Multi" MMSE, the solitons of the neighboring symbol groups, that have been launched right before or after the analyzed group, can also be taken into account ("Neighbors" in Fig. 8), since pulses from these launch windows are also involved in the collision and play a role in the range 1850 -2450 km. However, resulting further improvements are rather small. The MMSE equalizers manage to keep the BER below the SD-FEC limit of 2.2e-2 up to 2700 ...
