Patent ID: 7046890

Claim:
An optical fiber comprising: a central core having a relative refractive index delta Δ C , a multi-pedestal region in contact with and surrounding said core, said multi-pedestal region having an outer radius of less than 25 μm and at least two pedestals, each of said pedestals being in contact with and adjacent to at least one other pedestal, each of said pedestals having a relative refractive index delta Δ ped lower than Δ C , at least one of said pedestals having Δ ped value higher than 0.2% and a width of less than 6 μm and another one of said pedestals having Δ ped value lower than 0.2%; and another region in contact and surrounding said multi-pedestal region, said another region having relative refractive index delta which is lower than that of any pedestal.