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optical communication numerical aperture

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rajasekharnbkrist

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Why the numerical aperture is less for long distance optical signal transmission and high for small distance optical signal transmission. Please explain the reasons
 

c_mitra

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When you are focussing the source on an optical fibre, you want to collect as much light as possible and you will need a high NA. I am not going to make a drawing but I hope this is clear. Fibre is optimum carrier for long distance communication.

When you are in open air, You will try to make a parallel beam for this purpose you will need a small NA; high NA will not focus well. This is useful only for a short distance like a remote control.
 

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