Optical fiber is a glass waveguide which is normally as thin as human hair.

光纤是一种玻璃波导，通常和人的头发一样细。

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The demand of the optical waveguide device is increasing day by day.

对各种光波导器件的需求量也日益增大。

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The demand of the optical waveguide device is increasing day by day.

对各种光波导器件的需求量也日益增大。

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