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日本藤仓电线公司用VAD工艺制造了不同折射率差的色散补偿光纤,并检验了它们的性能.这些色散补偿光纤(DCF)的相对折射率差Δ为1.6%～3.5%.标称波长色散随DCF光纤的Δ增加而增加,具有最高的Δ=3.5%的光纤在1.55μm波长下得到了-140ps/nm·km的最大标准波长色散.DCF光纤的传输损耗也随Δ增加而增加,因为瑞利散射损耗和缺陷损耗增加了.从实用的观点看,人们需要高波长色散和低传输损耗的DCF光纤.因此,Δ=2.6%的DCF
Fujikura Co., Ltd., Japan, manufactured and tested their dispersion-compensating fibers with different refractive index differences using the VAD process.The relative refractive index difference Δ of these dispersion-compensating fibers (DCF) was 1.6% to 3.5% As the delta of the DCF fiber increases, the fiber with the highest delta = 3.5% gives a maximum standard wavelength dispersion of -140 ps / nm.km at a wavelength of 1.55 μm The transmission loss of a DCF fiber also increases with Δ since Rayleigh scattering and defect losses increase.From the practical point of view, one needs a DCF fiber with high wavelength dispersion and low transmission loss.Therefore, Δ = 2.6% DCF