[1] [1] Y. Emori, Κ. Tanaka, S. Namiki. 100 nm bandwidth flat-gain Raman amplifiers pumped and gain-equalised by 12-wavelength-chaniiel WDM[J]. Electron. Lett., 1999, 35(16):1355-1356

[2] [2] S. Kawai, H. Masuda, K. Suzuki et al.. Wide-bandtli and long-distance WDM transmission using highly gain-flattened hybrid amplifier[J]. IEEE Photonics Technol. Lett., 1999, 11(7):886-888

[3] [3] Variable polarization beam splitter,combiner and mixer [P].US Patent5740288

[4] [4] Miiltibeam photoscanner[P]. US.Patent4637679

[5] [5] R. W. Gilsdorf, J. C. Palais. Single-mode fiber coupling effiency with gradient-index rod lenses [J]. Appl. Opt., 1994, 33(16):3440-3445