| 摘要 |
The present invention relates in one aspect, to a refractive index profile designed to support higher order spatial modes, and in particular the LP02 spatial mode in an optical waveguide. The waveguide exhibits negative dispersion and negative dispersion slope and negative third order dispersion over the operating wavelength. In one embodiment, the profile is designed with a reduced refractive index depression in the center core region, and is intended to enhance the properties of the dispersion compensating waveguide. In addition, the refractive index profile of the present invention supports the LP02 mode. A limited mode dispersion compensating optical waveguide according to the present invention includes a center core portion having a center core refractive index. The waveguide also includes an outer core portion surrounding the center core portion and having an outer core refractive index that is greater than the center core refractive index. The waveguide further includes a first cladding portion surrounding the outer core portion and having a first cladding refractive index that is less than the outer core refractive index. In another embodiment, the ratio of the difference between the outer core refractive index and the center core refractive index to the outer core refractive index is greater than about 0.2%. The dispersion compensating optical waveguide supports at least one high order spatial mode.
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