A novel large-mode-area Bragg fiber （BF） is proposed for selectively suppressing the amplified spontaneous emission （ASE） of Yb. Confinement loss can be effectively lowered by adding a layer of F-doped glass near the core of this fiber. The BF can achieve effective suppression of ASE of Yb when the bend radius is 0.15 m at wavelength lower than 1.13 μm in theory, and eliminate LP 11 mode in mode competition in wavelength range of 1.15 1.2 μm.
High power supercontinuum generation has witnessed rapid developments during the past few years. The mecha- nism and the latest achievements in high power supercontinuum generation are reviewed both for the continuous wave pump regime and the pulsed pump regime. The challenges in scaling the average power of supereontinuum generation are analyzed. Some of our works on high power supercontinuum generation are summarized, and perspectives for the future development are discussed.
