[3] Wei Chaojiong, Zha Kaide. The high coupling efficiency for DFB laser-to-fiber. SPIE,1996,2895:340~344
[4] Virendra S S, Lyn C, Richard S V, et al. Efficient power coupling from 980 nm, broad area laser to a single mode fiber using a wedging shaped fiber endface. Journal of Lightwave Technology,1990,18(9):1313~1318
[5] Cohen L,Schneider M V. Micro lenses for coupling junction lasers to optical fibers. Appl Opt, 1974,13(1): 89
[6] Kyung S L, Frank S B. Microlense on the end of single mode optical fibers for laser applications. Appl Opt, 1985,24(19):3134~3139