supported by the National Natural Science Foundation of China (Grant Nos. 11078009,U1331114,61107059 and 61307076);the 111 project (B13015) to Harbin Engineering University;the Fundamental Research Funds for the Central Universities;the Opening Project of Key Laboratory of Astronomical Optics and Technology,Nanjing Institute of Astronomical Optics and Technology,Chinese Academy of Sciences
A photonic lantem is studied which is formed by seven multimode fibers inserted into a pure silica capillary tube. The core of the tapered end has a uniform refractive index because the polymer claddings are removed b...