8Tsai S C, Tsai T C, Law P C. High pumping-efficiency L-band erbium-doped fiber ASE source using double-pass bidirectional-pumping configuration[J]. IEEE Photonics Technology Letters, 2003, 15(2): 197-199.
9Riant I. UV-photo-induced fibre gratings for gain equalization[J]. Optical Fiber Technology, 2002, 8(3): 171-194.