Ch2Sec4BW

Ch2Sec4BW - 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 2.4 2 Section 2.4 Numerical Aperture Consider an optical receiver: f d d Photodetector Incoming rays The photodetector surface area diameter is d.
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Joseph C. Palais 2.4 3 NUMERICAL APERTURE f d Consider an off axis beam: θ θ Light incident beyond the acceptance angle θ will not be focused onto the detector surface.
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Joseph C. Palais 2.4 4 NUMERICAL APERTURE θ sin 2 tan o n NA f d = From the previous slide, we see that (2.11) The numerical aperture is defined as n o is the index of refraction for the surrounding media. It usually has a value of unity. θ is the acceptance cone half-angle
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Joseph C. Palais 2.4
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Ch2Sec4BW - THE FIBER FORUM Fiber Optic Communications...

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