Lecture 1 - ECE135 NadirDagli SantaBarbara,CA93106...

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ECE 135 O ti l Fib C i ti Optical Fiber Communications N di D li Nadir Dagli Electrical and Computer Engineering Department University of California Santa Barbara, CA 93106 [email protected]
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Electrical input (data) V in A Digital Optical Link Unmodulated optical waveform Modulated optical waveform 1 0 1 0 0 0 1 0 Optical modulator O i l Time Optical amplifier Laser Optical fiber Time R I V out Cl k A f Time Clock recovery and decision circuitry 1 0 1 0 0 0 1 0 Receiver Electrical output (data)
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Desirable properties of fiber Low attenuation Large bandwidth available Small size and weight Low cost c f λ = 8 3 10 m/s c = × 8 14 3 10 m/s 2 00 10 1/s (Hz) = 200 THz f × × 1 6 2.00 1.5 10 m = = × 8 14 2 6 3 10 m/s 2.31 10 1/s (Hz) = 231 THz 1 3 10 f × = = × 1.3 m × 2 1 31 THz f f f Δ = = Huge bandwidth!
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