A novel design of cluster-small-core tellurite microstructured optical fiber

A novel cluster-small-core tellurite microstructured optical fiber (MOF) which possesses high nonlinearity and supports high-power transmission in the small core is presented in the paper. When the light is coupled to the input end of this MOF, a large effective mode area can be obtained. At the odd times of coupling length, the light will be coupled to the central single core and the intensity in central single core will increase by nearly 7-fold. Therefore, the MOF not only has the same nonlinearity coefficient with the central single core, but also can support high-power beam transmission. It effectively decreases the likelihood of breaking the input end of single-core MOF when directly pumped with high-power beam.