H. K. Seo, J. U. Jeon, Y. H. Cho, K. T. Jeong, B. S. Choi, and S. I. Choi, "Gain and noise figure improvement of erbium-doped fiber amplifiers by optimizing spectral splicing conditions,"
in Optical Fiber Communication Conference,
Vol. 2 of 1998 OSA Technical Digest Series
(Optical Society of America, 1998), paper WM48.