Perturbation theory of a doubly clad optical fiber with a low-index inner cladding |
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Authors: | Kawakami S Nishida S |
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Affiliation: | Tohoku University, Sendai, Japan; |
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Abstract: | A doubly clad optical fiber which is composed of the core, inner cladding, and outer cladding is called aW-type fiber when the core has the largest index of refraction of the three and the inner cladding has the lowest. AW-type fiber is known to have several advantages over a conventional singly clad (SC) fiber. This paper presents simple, closed form approximations of aW-type fiber with respect to cutoff, the attenuation constant in the leaky wave region and a rapid change of the group velocity near cutoff, etc. In the approach to be described, aW-type fiber is thought of as a combined system of an SC fiber and an outer perturbing medium. |
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