Measurements of harmonic distortion produced by a saturated optical amplifier with a nonlinear microwave network analyzer. - Philip Vael; Yves Rolain; Alain R. F. Barel; Andy Bliki (IEEE Trans. Instrum. Meas., 1998)

Broadband high-frequency hybrid. - Gerd Vandersteen; Alain R. F. Barel; Yves Rolain (IEEE Trans. Instrum. Meas., 2002)