optical fibre
B2-C1Technical/Formal. Most common in engineering, telecommunications, computing, and academic physics contexts.
Definition
Meaning
A thin, flexible strand of very pure glass (or sometimes plastic) designed to transmit light signals over long distances with minimal loss of signal strength.
The physical medium and technology used in high-speed telecommunications, broadband internet, medical imaging (endoscopy), and illumination systems, where data is encoded as pulses of light.
Linguistics
Semantic Notes
Refers both to the individual strand and the technology as a whole. In US spelling, 'fiber' is standard. The plural is typically 'optical fibres' (UK) / 'optical fibers' (US).
Dialectal Variation
British vs American Usage
Differences
Spelling: UK 'fibre', US 'fiber'. No significant difference in meaning or application.
Connotations
Identical technical connotations. The term is neutral and denotes high-tech infrastructure and speed.
Frequency
Equally frequent in technical registers in both regions. In everyday speech, 'fibre optic cable' or just 'fibre broadband' may be more common.
Vocabulary
Collocations
Grammar
Valency Patterns
[verb] + optical fibre: lay/install/use/break optical fibreoptical fibre + [verb]: optical fibre carries/transmits/crosses[preposition] + optical fibre: via/through/over optical fibreoptical fibre + [noun]: optical fibre cable/network/technology/connectionVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “[No direct idioms. The related term 'fibre optic' is often used adjectivally, e.g., 'fibre optic nerves' as a metaphor for fast information pathways.]”
Usage
Context Usage
Business
"The company invested millions in laying new optical fibre to support its cloud services."
Academic
"The experiment demonstrated quantum key distribution through 50 km of standard optical fibre."
Everyday
"Our new internet is much faster because they installed optical fibre to our street."
Technical
"Signal attenuation in single-mode optical fibre is typically below 0.2 dB per kilometre at 1550 nm."
Examples
By Part of Speech
verb
British English
- The council plans to fibre up the entire borough next year.
- New developments are being prioritised for fibre installation.
American English
- The telecom is working to fiber the rural communities.
- They haven't fibered our neighborhood yet.
adverb
British English
- [No standard adverbial form. Use prepositional phrases like 'via optical fibre'.]
American English
- [No standard adverbial form. Use prepositional phrases like 'via optical fiber'.]
adjective
British English
- We offer fibre broadband packages.
- The fibre network rollout is ahead of schedule.
American English
- We offer fiber internet packages.
- The fiber optic connection is extremely reliable.
Examples
By CEFR Level
- The internet is fast because it uses optical fibre.
- Optical fibre is made of glass.
- Our new phone line uses optical fibre technology.
- Signals travel very quickly through an optical fibre.
- The installation of optical fibre across the city has dramatically improved broadband speeds.
- Compared to old copper cables, optical fibre can carry much more data.
- The backbone of the modern internet consists of undersea cables containing multiple strands of optical fibre.
- Engineers are constantly refining the design of optical fibre to minimise signal dispersion and increase bandwidth.
Learning
Memory Aids
Mnemonic
Think of a very thin, flexible straw made of super-clear glass. Instead of sucking a drink, it sucks in pulses of light (data) and shoots them out the other end almost instantly.
Conceptual Metaphor
A HIGHWAY FOR LIGHT. Data packets are vehicles travelling at the speed of light down a clear, guided pathway.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid translating 'optical' as 'оптичный' (which implies optimal/suitable). Correct term is 'оптический' or 'оптоволоконный'.
- The full term is 'оптическое волокно'. Using just 'волокно' is ambiguous (could mean fibre as in dietary fibre or textile).
- Do not confuse with 'fiber' as in 'fiberboard' (древесноволокнистая плита) – the context is completely different.
Common Mistakes
- Incorrect plural: 'optical fibres' (UK) / 'optical fibers' (US), not 'optical fibrees'.
- Misuse of 'optic fibre' – 'optical' is the standard adjective form.
- Confusing it with 'fiber optics', which is the broader field of study or technology.
- Spelling inconsistency: mixing 'fibre' (UK) and 'optical' in the same text without regional consistency.
Practice
Quiz
What is the primary function of an optical fibre?
FAQ
Frequently Asked Questions
Very closely related. 'Optical fibre' refers to the thin strand of glass itself. 'Fibre optic cable' is the complete assembly containing one or more optical fibres, plus protective layers, strength members, and insulation.
Not from the side under normal conditions, as the light is trapped inside the core by total internal reflection. You can see light emitted from the cleaved ends if a visible light source (like a red laser) is used.
Extremely pure glass (silica) is transparent, allowing light to travel long distances with minimal loss or attenuation. It can also be drawn into very thin, flexible strands.
Single-mode fibre has a very narrow core, allowing only one path (mode) for light, ideal for long-distance, high-bandwidth communication. Multi-mode fibre has a wider core, allowing multiple light paths, used for shorter distances like within buildings.