Y. Sakata, M. Yamaguchi, S. Takano, J. Shim, T. Sasaki, M. Kitamura, and I. Mito, "Novel tunable twin-guide lasers with a carrier-control tuning layer,"
in Conference on Optical Fiber Communication/International Conference on Integrated Optics and Optical Fiber Communication,
Vol. 4 of 1993 OSA Technical Digest Series
(Optical Society of America, 1993), paper TuC3.