ENGRI111_13_photonics4

ENGRI111_13_photonics4 - ENGRI 111 1 Photodetectors 2...

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ENGRI 111 ENGRI 111 1. Photodetectors  2. Optical Fibers
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Photodetectors Photodetectors Photoconductive materials Light is used to excite charge carriers into higher energy states in an intrinsic semiconductor which can carry electrical current when voltage is applied Light sensitivity low slow e Ev Ec
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Photodiodes Photodiodes oe magazine, august 2001 p-n junction Reverse bias p-i-n junction
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+ - n-type p-type Depletion Region
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+ - n-type p-type
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Optical Fibers Optical Fibers www.neurophysics.com wikipedia
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35 Years Ago 35 Years Ago ……. .A Technological “Syzygy” Occurred
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And the Result! And the Result! 1 10 100 1000 1980 1985 1990 1995 2000 2005 Millions Internet Users PCs Moore's Law Fiber kms More Than 600 Million Users 652 Million PC’s in Use More than 1billion transistors per chip 650 million km of optical fiber deployed
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A Million-Fold Bandwidth A Million-Fold Bandwidth Increase Increase 10 10 10 8 10 6 10 4 10 2 1 1850 1900 1950 2000 Bit Rate (Bits/sec) 1st Telephone Coax-60 VC Oscillating Needle Telegraph 3600 VC 108,000 VC Fiber Optic Systems 10 12
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This note was uploaded on 04/09/2009 for the course MSE 111 taught by Professor Giannelis during the Fall '07 term at Cornell.

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ENGRI111_13_photonics4 - ENGRI 111 1 Photodetectors 2...

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