Fabrication of tapered silica-glass fibers with a Bragg multilayer cladding by a sputtering technique combining with a standard traveling burner tapering method is demonstrated. 1 μm-core Bragg tapers with mode field diameters about 1.1 μm have been successfully fabricated. Simulation of the mode intensity profiles for both our devices and air cladding silica tapers have been done by beam propagation method. The results agree well with these of experiment ones. Our devices have good adiabaticity and they are insensitive to the surrounding environment. These ultra-small core Bragg fibers will be a candidate of the mode couplers for nanosized optical devices.
展开▼
