S. J. B. Yoo, M. A. Koza, C. Caneau, and R. Bhat, "Simultaneous wavelength conversion of 2.5-Gbit/s and 10-Gbit/s signal channels by difference-frequency generation in an AlGaAs waveguide,"
in Optical Fiber Communication Conference,
Vol. 2 of 1998 OSA Technical Digest Series
(Optical Society of America, 1998), paper WB5.