'A' cited 'B'.



'A'

N. S. Moon, C. S. Goh, K. Kikuchi, and F. Kubota, "A novel bidirectional wavelength add-drop multiplexer based on fiber Bragg gratings and 4-port optical circulators," 2002 IEEE/LEOS Annual Meeting Conference Proceedings, vo1. 1, pp. 297-298, Glasgow, Scotland, Nov. 2002.



'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.