A possible misunderstanding resulting from the reading of J. Opt. Soc. Am. A 27, 435 (2010) is clarified.
© 2011 Optical Society of America
The formalism presented in Subsection 2.E of  dealing with single-mode waveguides was unduly restrictive, since it is only applicable to the case of spatially coherent astronomical targets, which is not the common case. For incoherent objects Eqs. (11) and (12) are no longer valid, and Eq. (13) that was written1] since only punctual sky objects were considered. Hence all equations presented in Section 5 remain valid, as well as results of numerical simulations and the general conclusion. Readers should nevertheless be aware that the formalism of Section 5 is not suitable for spatially extended, incoherent sky objects.
The author would like to thank his colleague Y. Rabbia for drawing his attention to the possible confusion.
1. F. Hénault, “Simple Fourier optics formalism for high angular resolution systems and nulling interferometry,” J. Opt. Soc. Am. A 27, 435–449 (2010). [CrossRef]