In normal optical fibres made from materials with positive refractive indices, this makes the effective thickness of the cable greater than its physical thickness.

在正常的用具有阳性折射指数制作的多个光导纤维中，这种情况会让电缆的有效厚度高于它的实际物理厚度。

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Shanghai Honghui Optics Communication Material Co. , Ltd is major in specialized production of optical cable, electric cable supporting materials and communication equipment.

上海鸿辉光通材料有限公司是从事光，电缆辅助材料及通讯器材的专业生产性企业。

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