1. S. Ohara, N. Sugimoto, Y. Kondo, K. Ochiai, Y. Kuroiwa, Y. Fukasawa, T. Hirose, H. Hayashi, S. Tanabe, Proc. SPIE 4645, 2002, p. 8.
2. B. Cole, M.L. Dennis, In Proc. OFC’01, Anaheim, USA, paper TuQ3, 2001.
3. M.L. Dennis, B. Cole, US patent, Appl. No. 261619, October 2, 2002.
4. B.N. Samson, N.J. Traynor, D.T. Walton, A.J.G. Ellison, J.D. Minelly, J.P. Trentelman, J.E. Dickinson, In Proc. OAA’00, Quebec City, Canada, paper PD6, 2000.
5. B. Faure, W. Blanc, B. Dussardier, G. Monnom and P. Peterka, In Proc. of OAA’04, San Francisco, USA, paper OWC2, 2004.