'A' cited 'B'.

'A'
Four-wave mixing assisted multiwavelength peak-power-equalized semiconductor optical amplifier laser
Author(s): Ning G (Ning, G.), Shum R (Shum, R.), Zhou JQ (Zhou, J. Q.), Xia L (Xia, L.)  
Source: OPTICAL ENGINEERING    Volume: 46    Issue: 12  Article Number: 125008    Published: 2007    
Authors' address:
Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore, Singapore

'B'
Channel-spacing- and wavelength-tunable multiwavelength fiber ring laser using semiconductor optical amplifier
Author(s): Roh S (Roh, Sookyoung), Chung S (Chung, Seunghwan), Lee YW (Lee, Yong Wook), Yoon I (Yoon, Ilyong), Lee B (Lee, Byoungho)  
Source: IEEE PHOTONICS TECHNOLOGY LETTERS    Volume: 18    Issue: 21-24    Pages: 2302-2304    Published: 2006