Lecture3-228a s10-1

Lecture3-228a s10-1 - Lecture 3 Fiber Optics Modes Loss and...

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Lecture 3 - Fiber Optics – Modes, L d Di i Loss, and Dispersion ECE 228A 3.1
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Lecture 2 Review •Step index: Simplest type of fib fiber •(Most fiber these days is far more complex) •Cylindrical symmetry •Express Laplacian operator in cylindrical coordinates 2 2 2 2 2 2 2 2 1 1 z r r r r •Separate variables (p. 31) ) ( ) ( ) ( ) ( Z F E , , z z z
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V parameter V<2.405 for single mode
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Fiber Modes
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Fib O i C i i S Fiber-Optic Communication Systems 1 2 2 2 1 2 sin n n n n NA ext c The index difference between core and cladding determines the acceptance angle (numerical aperture) of fiber. 2 1 n n p.25
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Two primary limits to transmission Loss: Loss budget for loss limited transmission Dispersion: Dispersion budget for dispersion limited transmission.
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Comparison to electrical cable
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