1. Won-Seok Park, Minsu Shin and Hyang-Won Lee, Journal of Lightwave Technology 27, 3820 (2009).
2. Pedro Joao, Monteiro Paulo and Pires Joao, Broadband Communications Networks and Systems 10, 2 (2007).
3. Rajabi. A, Dadlani. A, Hormozdiari. F, Khonsari. A, Kianrad. A and Razi. H. S, Broadband Communications Networks and Systems 13, 259 (2008).
4. Tanida. H, Ohmae. K, Young-Bok Choi and Okada. H, IEEE GLOBECOM 5, 2601 (2003).
5. Hou Rui, Sun Jun-qiang and Ding Pan-feng, Journal of Electronics & Information Technology 28, 747 (2006). (in Chinese)