TURNKEY FIBRE SOLUTIONS :

Home

About Us

Ask the Experts

Testimonials

Questions and Answers

Useful Links

	Installations

	Products

Patchcords & Pigtails

Components

Cabinets & Enclosures

Pre-terminated Assemblies

Wide Range of Copper

Attenuators

Media Converters

Mode Conditioning Patchcord

Fibre Loopback Assemblies

Fibre Consumables

Fibre Tools & Equipment

Launch Leads

Fibre Cable

Questions and Answers >> What is the Numerical Aperture (NA)?

Numerical aperture (NA) of the fibre defines which light will be propagated and which will not. NA defines the light-gathering ability of the fibre. Imagine a cone coming from the core. Light entering the core from within this cone will be propagated by total internal reflection. Light entering from outside the cone will not be propagated.

A high NA gathers more light, but lowers the bandwidth. A lower NA increases bandwidth.

NA has an important consequence. A large NA makes it easier to inject more light into a fibre, while a small NA tends to give the fibre a higher bandwidth. A large NA allows greater modal dispersion by allowing more modes in which light can travel. A smaller NA reduces dispersion by limiting the number of modes.

10 of 16


Home \| About Us \| Ask the Experts \| Testimonials \| Questions and Answers \| Useful Links \| Contact Us