We recently presented results pertaining to the impact of nonlinear phase noise on the wavelength conversion of quadrature phase shift signals using four-wave mixing. <xref ref-type="fn" rid="fn1" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><sup>1</sup></xref> We provide a qualitative description of the resulting FM-noise spectral density in the high pump OSNR regime. <fn id="fn1" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><label>1</label> A. P. Anthur et al., “Impact of nonlinear phase noise on all-optical wavelength conversion of 10.7 GBaud QPSK data using dual correlated pumps,” <i>IEEE J. of Quantum Electron.</i> 51, No. 4, 9100105, 2015. </fn>