Ch2Sec2BW

# Ch2Sec2BW - 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 2.2 2 Section 2.2 Lenses n Consider a thin lens: D Fiber f P (Focal Point) Focal Length Index of Refraction
Joseph C. Palais 2.2 3 LENSES R 1 and R 2 are the radii of curvature of the lens. R

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Joseph C. Palais 2.2 4 LENSES The focal point for a thin lens is found by 1 2 1 1 1 ( 1) n f R R f f number of the lens D = - + = - (2.4)
Joseph C. Palais 2.2 5 LENSES If f (focal length) is large, then R 1 and R 2 must be large making the lens a fairly flat surface. If f (focal length) is small, then R 1 and R 2 must be small. This limits the lens size, since D max = 2R. Lenses are used to couple light sources to fibers and in some connectors coupling light between fibers.

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Joseph C. Palais 2.2 6 RAY TRACING RULES 1. Rays traveling through the center of the lens are not deviated. 2. Incident rays traveling parallel to the lens axis pass through the focal point after emerging from the lens.
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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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Ch2Sec2BW - THE FIBER FORUM Fiber Optic Communications...

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