核心的石英折射系数高，环绕在外的外层石英与孔洞交错，所以折射系数较低。
The core has a high index of refraction, whereas the surrounding cladding, with its air holes interspersed with silica, has a lower index.
核心的石英折射系数高，环绕在外的外层石英与孔洞交错，所以折射系数较低。
The core has a high index of refraction, whereas the surrounding cladding, with its air holes interspersed with silica, has a lower index.
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