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Note for Optical Fiber Communication - OFC By Sundram Gupta

  • Optical Fiber Communication - OFC
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Fiber Optic Sources Two basic light sources are used for fiber optics: lasers and light-emitting diodes (LED). Each device has its own advantages and disadvantages as listed in Table Characteristic LED Laser Output power Lower Higher Spectral width Wider Narrower Numerical aperture Larger Smaller Speed Slower Faster Less More Easier More difficult Cost Ease of operation w.wang A. Guenther UCONN

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Output Power Current Coupled Power Speed Linearly proportional to drive current Drive Current: 50 to 100 mA Peak Moderate Proportional to current above the threshold Threshold Current: 5 to 40 mA High Slower Faster Higher Lower Moderate High 0.66 to 1.65 µm 0.78 to 1.65 µm Wider (40-190 nm FWHM) Narrower (0.00001 nm to 10 nm FWHM) Fiber Type Multimode Only SM, MM Ease of Use Easier Harder Lifetime Longer Long Cost Low ($5-$300) High ($100-$10,000) Output Pattern Bandwidth Wavelengths Available Spectral Width w.wang A. Guenther UCONN

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LASER LASAER = light amplification by stimulated emission of radiation Invented dated to 1958 with the publication of the scientific paper, Infrared and Optical Masers, by Arthur L. Schawlow, then a Bell Labs researcher, and Charles H. Townes, a consultant to Bell Labs w.wang

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Property of Laser Light • Nearly"monochromatic: consists of an extremely narrow range of wavelengths • Highly Directional: travel in a single direction within a narrow cone of divergence • Highly Coherence: coherence is the most fundamental property of laser light and distinguishes it from the light from other sources w.wang

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