'A' cited 'B'.

'A'
Channel-spacing and wavelength switchable multiwavelength erbium-doped fiber laser using sampled Hi-Bi fiber grating and photonic crystal fiber loop mirror
Author(s): Liu ZY (Liu, Z. -Y), Liu YG (Liu, Y-G.), Du JB (Du, J. -B.), Yuan SZ (Yuan, S. -Z), Dong XY (Dong, X. -Y.)  
Source: LASER PHYSICS LETTERS    Volume: 5    Issue: 2    Pages: 122-125    Published: FEB 2008    
Authors' Addresses:
Nankai Univ, Inst Modern Opt, Minist Educ, Key Lab Optoelect Informat & Technol, Tianjin 300071, Peoples R China

'B'
Multiwavelength-switchable SOA-fibre ring laser using sampled Hi-Bi fibre grating
Author(s): Yu BA, Kwon J, Chung S, Seo SW, Lee B  
Source: ELECTRONICS LETTERS    Volume: 39    Issue: 8    Pages: 649-650    Published: APR 17 2003