- Michel E Marhic: College of Engineering, Swansea University, Singleton Park, Swansea SA2 8PP, UK. m.e.marhic@swan.ac.uk
Following a fiber optical parametric amplifier, used as a wavelength converter or in the phase-sensitive mode, by a phase-insensitive amplifier (PIA) can significantly reduce four-wave mixing between signals in broadband systems. We derive the quantum mechanical noise figures (NF) for these two hybrid configurations, and show that adding the PIA only leads to a moderate increase in NF.