Conference Name:International Conference on Advanced Infocomm Technology 2011, ICAIT 2011. Conference Address: Wuhan, China. Time:July 11, 2011 - July 14, 2011.We experimentally demonstrate an L-band multiwavelength Raman fiber laser based on the three-mixed-cascaded stimulated Raman scattering (SRS) of both P2O5 and SiO2/GeO2 in a phosphosilicate fiber. A 1064 nm Yb3+-doped double-clad fiber laser (YDCFL) is used to pump a spool of 1-km phosphosilicate fiber. The three-stage mixed-cascaded Raman cavity is arranged as: 1) the 1st- and 2nd-order Raman cavities use the SRS of P2O5 and are formed by the two pairs of highly-reflective fiber Bragg gratings at 1239 and 1484 nm, respectively; 2) the 3rd-order Raman cavity uses the SRS of SiO 2/GeO2 and is completed by a polarization-maintaining fiber (PMF) Sagnac comb filter and a broadband fiber loop mirror. When the injected pump power from YDCFL is 4.8 W, up to 12-wavelength stable oscillation around 1601 nm has been obtained with wavelength spacing of 0.58 nm and extinction ratio of >30 dB
