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Fiber Optics Communications. 2. BRIEF HISTORY OF OPTICAL COMMUNICATIONS. Early system: smoke signals, signaling lamps, semaphore flags
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1. Fiber Optics Communication Minglie Hu
OPTI 422
9/15/2003
2. Fiber Optics Communications 2 BRIEF HISTORY OF OPTICAL COMMUNICATIONS Early system: smoke signals, signaling lamps, semaphore flags – ~1 b/s, 100km
1830, Morse Coding keying – ~10b/s, 1000km
1876, telephone - W.W Telephone networks
1940, coaxial cable, 3MHz – 30 voice channels or one TV channel
1948, Microwave system, 4GHz
1960, fibers, loss ~ 1000db/km
First Generation fiber, loss~2db/km
Today, 10Gb/s, 02.-0.3db/km
Future, 40Gb/s, even lower loss
3. Fiber Optics Communications 3 BASIC POINT-POINT FIBER COMMUNICATION SYSTEM
4. Fiber Optics Communications 4 BASIC THEORY Geometric theory Total Internal Reflection Critic Angle