Nonlinearity of InP-Doped Fibers

By combining nano-technology with fiber technology, an optical fiber doped with semiconductor nano-particles as InP is fabricated by using the modified chemical vapor deposition （MCVD） method. Proved by experiment, the fiber has excellent waveguide characteristics, and the concentration of InP is approximately 0.1~o. By using a scanning electron microscope, a stereo-scan photograph of the fiber is obtained, and based on the graph, presentations of the fiber under both magnetic and electronic fields are simulated, the effective core area Aeff≈ 10μm^2 is calculated, and so is the nonlinear index γ = 10.53 W^-1/Km of the fiber. This research leads a new method of high nonlinearity fiber fabrication.     

Suppercontinuum Generation in InP Nano Inner Cladding Fibers

The InP nano inner cladding fiber is fabricated by the method of modified chemical vapor deposition. The thickness of the InP nano thin film is about 16 nm. A 20 dB supercontinuum over 100nm in the telecommunication band is generated by infecting 1550nm, 120fs, 50MHz repetition rate optical pulse into this kind of fiber. Moreover, the results indicate that the width of the supercontinuum spectra can be influenced by the fiber length and pump power. The longer fiber at higher pump power can produce broader supercontinuum spectrum.