Evolution of silica-based highly nonlinear fibers for FWM-based wavelength conversion application
Recent progresses on silica-based highly nonlinear fibers for practical FWM-based applications such as wavelength conversion efficiency enhancement and chromatic dispersion design are described, and then functional wavelength conversions using the fibers are demonstrated.
Multi-step-index bismuth-based highly nonlinear fiber with low propagation loss and splicing loss
Propagation loss and practical fusion-splicing loss of bismuth-based fibers are reduced to 0.8 dB/m and 2.6 dB/point, respectively, while maintaining high nonlinearity of 1100 W/sup -1/ km/sup -1/ by modifying the glass composition and eliminating the cladding mode.
Small-core As-Se fiber for Raman amplification.
We have demonstrated Raman small-core As-Se fiber. More than 20-dB of gain was observed in a 1.1-m length of fiber pumped by a nanosecond pulse of approximately 10.8-W peak power at 1.50 microm. The peak of the Raman gain occurred at a shift of approximately 240 cm(-1). The Raman gain coefficient is estimated to be approximately 2.3 x 10(-11) m/W, which is more than 300 times greater than that of silica. The large Raman gain coefficient coupled with the large IR transparency window of these fibers shows promise for development of As-Se Raman fiber lasers and amplifiers in the near-, mid-, and long-IR spectral regions.