Ch4sec5 - THE FIBER FORUM Fiber Optic Communications...

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THE FIBER FORUM Fiber Optic Communications JOSEPH C. PALAIS PRESENTED BY
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Joseph C. Palais 4.5 2 Section 4.5 Dispersion And Distortion In The Slab Waveguide 4.5.1 Waveguide Dispersion Recall (3.14) for pulse spreading by material dispersion. λ τ - = - = M n c L "
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Joseph C. Palais 4.5 3 g M Similarly, in a waveguide we have " eff g n M L c τ λ = - = - Waveguide Dispersion The waveguide dispersion is: The source spectral width is:
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Joseph C. Palais 4.5 4 Waveguide Dispersion n eff TE 0 mode 2 λ d Mode Chart 1 d d/ λ
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Joseph C. Palais 4.5 5 ∆ λ = λ 2 - λ 1 For a fixed d ( slab thickness), n eff varies with λ . Thus, different wavelengths from the same source travel at different speeds. This yields pulse spreading. This is waveguide dispersion . Waveguide Dispersion
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4.5 6 Waveguide Dispersion Since n 1 and n 2 also vary with wavelength, material dispersion exists in addition to waveguide dispersion. The total dispersive pulse spread is the sum of the
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This note was uploaded on 05/11/2010 for the course EEE EEE-448 taught by Professor Palais during the Fall '09 term at ASU.

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Ch4sec5 - THE FIBER FORUM Fiber Optic Communications...

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