Template:Optical telecommunication
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Optical telecommunication
Basic
Smoke signal
Beacon
Hydraulic telegraph
Ships flags
Semaphore line
Heliograph
Signal lamp
Advanced
Fiber-optic telecommunication
Free-space optical telecommunication
Optical wireless
Optical fiber
cable
connector
Optical Carrier
Photophone
Intensity modulation
Modulating retro-reflector
Optical Transport Network
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