"A" cited "B".



"A":

A. V. Tran, C.-J. Chae, and R. S. Tucker (Univ. of Melbourne, Australia), "Bidirectional optical add/drop multiplexer for single-fiber metro networks," IEEE Lasers and Electro-Optics Society (LEOS) Annual Meeting, San Diego, CA, USA, Nov. 2001, pp. 744-745.



"B":

J. Kim and B. Lee, "Bidirectional wavelength add-drop multiplexer using multiport optical circulators and fiber bragg gratings," IEEE Photonics Technology Letters, vol. 12, no. 5, pp. 561-563, 2000.