Fig. 9: Measured FWM inside 7.7 km of HCF (red) and 7.4 km SSMF (blue). | Light: Science & Applications

Fig. 9: Measured FWM inside 7.7 km of HCF (red) and 7.4 km SSMF (blue).

From: Low-loss microwave photonics links using hollow core fibres

Fig. 9

Two CW laser signals with wavelengths 0.4 nm (50 GHz) apart (their absolute wavelengths are marked with green dashed lines), each with 27 dBm power, are launched into the respective fibres. The output shows FWM products as new signals 50 GHz apart from the two input signals, They are about 20 and 55 dB weaker than the original signals in the SSMF and HCF cases, respectively, showing significantly weaker FWM interaction in the HCF as compared to the SSMF

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