01 EE 474 Introduction 2010

01 EE 474 Introduction 2010 - EE 474 Introduction to...

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EE 474 Introduction to Photonics Photonics – Transmission, storage, processing, and display of information using photons. Also includes detection of optical signals and optical energy Application Wavelength ( μ m) Controlling Element Attributes Telecommunications 1.3 – 1.55 1.48, 0.98 Fiber loss and dispersion Distance ~km, λ control, WDM, digital, bit rate Data Communications 0.8 – 1.55 Multimode, fiber dispersion, cost Bit Rate, Distance < km, parallelism Optical Storage / Recording / Printing 0.78 0.65 0.4 Spot size, information density Single mode, high power, spot size Industrial Processes 0.808 POWER SSL Pumpimg Point of Sale Equip. Visible Cost Compact, low power Medical Systems Visible Power, precision Cost, Compactness Sensors IR UV Varies Compactness, cost Lighting and Displays Visible Area, density Efficiency, life, compactness
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Telecommunications The basic requirement of telecommunications is the long distance transmission of high bandwidth information, measured as distance x bandwidth. Optical fiber based systems provide lowest cost high bandwidth transmission medium. This is the result of the improvement of both the fiber itself as well as the devices used in the system. TX RX R λ 1 TX RX A λ 1 TX RX A λ 1 λ 2 λ 3 λ n λ 1 λ 2 λ 3 λ n MUX DEMUX
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Worldwide Fiber Networks TX RX Repeater λ 1 TX RX Amplifier λ 1 TX RX A λ 1 λ 2 λ 3 λ n λ 1 λ 2 λ 3 λ n MUX DEMUX Undersea cables were made possible in the ’70’s by the development of low loss optical fibers and components operating at the minimum loss point. WDM systems with 1 Tb/s capacity were made Possible in the ’80’s by the development of the fiber optical amplifier. 1.55 μ m 1.3 μ m
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Optical Amplifiers
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Optical Amplifier Architecture
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Transoceanic Fiber Cables
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Basic Concepts t T B T B is the bit time or bit slot Bit Rate is B = 1/T B . Analog and Digital Signals
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This note was uploaded on 02/23/2011 for the course EE 474 taught by Professor Lingo during the Spring '11 term at USC.

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01 EE 474 Introduction 2010 - EE 474 Introduction to...

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