Translation guide
A thin, flexible strand of glass or plastic used to transmit light signals, primarily for high-speed data communication.
The physical medium used in telecommunications and networking.
The most common and standard term for optical fibre in Japanese. Used in both technical and everyday contexts.
この建物は光ファイバーでインターネットに接続されています。
This building is connected to the internet via optical fibre.
A variant spelling without the long vowel mark. Equally common in technical documents.
光ファイバケーブルの敷設工事が始まった。
The installation work for the optical fibre cable has begun.
Literally 'optical cable'. Often used when referring to the cable as a whole, including its protective jacket.
光ケーブルは銅線より高速なデータ伝送が可能です。
Optical cables enable faster data transmission than copper wires.
Full term combining 'optical fibre' and 'cable'. Used in specifications and formal contexts.
光ファイバーケーブルの損失を測定する。
Measure the loss of the optical fibre cable.
Referring to the technology or concept of optical fibre communication.
Same as the physical cable, but used in abstract contexts like 'optical fibre technology'.
光ファイバー技術は通信速度を飛躍的に向上させた。
Optical fibre technology has dramatically improved communication speeds.
Referring to fibre-optic internet connections, often in consumer contexts.
Commonly used by ISPs and consumers to mean 'fibre optic line' or 'fibre internet connection'.
光回線に乗り換えたら、動画がスムーズに見られるようになった。
After switching to a fibre optic line, videos play smoothly now.
Means 'fibre internet'. Used in marketing and casual conversation.
このマンションは光インターネット対応です。
This apartment is equipped for fibre internet.
光ファイバー refers specifically to the glass or plastic fibre itself, while 光ケーブル refers to the entire cable assembly including protective layers. In everyday use, they are often interchangeable, but in technical contexts, the distinction matters.
光ファイバーは髪の毛ほどの細さです。
An optical fibre is as thin as a human hair.
光ケーブルを壁の中に通す。
Run the optical cable through the wall.
In Japanese, '光' (ひかり) is often used as a prefix to indicate fibre-optic or optical technology. For example, 光回線 (fibre optic line), 光通信 (optical communication), 光ネットワーク (optical network). This is a productive pattern.
データは光ファイバーを通じて伝送されます。
The data is transmitted through optical fibres.
光ファイバーケーブルは海底に敷設されています。
Optical fibre cables are laid under the ocean.
Means 'optical communication'. Often used when the emphasis is on the communication method rather than the physical medium.
光通信は電磁干渉に強い。
Optical communication is resistant to electromagnetic interference.