Abstract
In optical communications, four-wave mixing (FWM) is being explored for all-optical signal processing applications such as wavelength conversion. We previously demonstrated a robust scheme that was transparent to amplitude, phase and polarization of an optical signal, using a single nonlinear semiconductor optical amplifier (SOA) and two pumps with parallel polarizations [1]. We showed that it is possible to achieve polarization insensitive wavelength conversion using a single SOA by setting the detuning between the two pumps (pump-1 and pump-2), lower than that between the pumps and the signal (s), thereby achieving η 1 >> η 2 , where η: and η2 are the efficiency of the two FWM processes generating the idler frequency at ω p1 –ωp 2 + ros [1]. Here, we show that when the detuning between the two pumps are not significantly lower than that between the pumps, FWM causes polarization dependent loss (PDL), given by, PDL (dB) = 10 log 10 ((η 1 +η 2 )/ η 1 ).
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