NEW SBS SUPPRESSION FIBER WITH UNIFORM CHROMATIC DISPERSION TO ENHANCE 4-WAVE-MIXING

A new type of stimulated Brillouin scattering (SBS) suppression fiber has been developed whose dopant concentration and core radius are nonu niform along its length. The chromatic dispersion distribution is kept uniform along its length by varying the core radius in accordance wit h the a value to enhance four-wave mixing (FWM) intentionally. The out put power of the FWM signal with this fiber was about 15 dB higher tha n that with a conventional disperion-shifted fiber when the input powe r was 15 dBm, which is just above the SBS threshold power.