'A'
Multiport polarization-independent wavelength-interleaving bidirectional quasicirculator
Author(s): Hsieh PJ (Hsieh, Po-Jen), Su DC (Su, Der-Chin)  
Source: OPTICAL ENGINEERING    Volume: 47    Issue: 5  Article Number: 055001    Published: MAY 2008    
Authors' address:
1. Natl Chiao Tung Univ, Dept Photon, Hsinchu 30050, Taiwan
2. Natl Chiao Tung Univ, Inst Elect Opt Engn, Hsinchu 30050, Taiwan

'B'
Bidirectional wavelength add-drop multiplexer using multiport optical circulators and fiber Bragg gratings
Author(s): Kim J, Lee B  
Source: IEEE PHOTONICS TECHNOLOGY LETTERS    Volume: 12    Issue: 5    Pages: 561-563    Published: MAY 2000