光纤 (guāngxiān): optical fiber

Measure Word

一根光纤 gēn

Zhè dòng lóu yǐjīng pūshè le guāngxiān wǎngluò.

This building has already been fitted with a fiber optic network.

Guāngxiān chuánshū sùdù bǐ tóngxiàn kuài de duō.

Fiber optic transmission speed is much faster than copper wire.

Wǒ jiā shàng zhōu jiētōng le guāngxiān kuāndài.

My home was connected to fiber broadband last week.

memory

光 means light, 纤 means slender/fiber — light travels through a slender fiber.

光 guāng

纤 xiān