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This range of angles is called the acceptance cone of the fiber. There is a maximum angle from the fiber axis at which light may enter the fiber so that it will propagate, or travel, in the core of the fiber. The sine of this maximum angle is the numerical aperture (NA) of the fiber. Fiber with a larger NA requires less precision to splice and ...
The numerical aperture of a multimode optical fiber is a function of the indices of refraction of the cladding and the core: Diagram showing how the light refracts at the core/cladding interface. With the angle of refraction being dependent upon the difference in index of refraction, n, of core and cladding.
Note that when this definition is used, the connection between the numerical aperture and the acceptance angle of the fiber becomes only an approximation. In particular, "NA" defined this way is not relevant for single-mode fiber. [7] [8] One cannot define an acceptance angle for single-mode fiber based on the indices of refraction alone.
A guided ray (also bound ray or trapped ray) is a ray of light in a multi-mode optical fiber, which is confined by the core.. For step index fiber, light entering the fiber will be guided if it falls within the acceptance cone of the fiber, that is if it makes an angle with the fiber axis that is less than the acceptance angle, [1]
Acceptance angle may refer to: Half of the angular aperture of an optical system Acceptance angle (optical fiber) , the angle in an optical fiber below which rays are guided rays
Rays of light enter the fiber with different angles to the fiber axis, up to the fiber's acceptance angle. Rays that enter with a shallower angle travel by a more direct path, and arrive sooner than rays that enter at a steeper angle (which reflect many more times off the boundaries of the core as they travel the length of the fiber). The ...
The limit on maximum concentration (shown) is an optic with an entrance aperture S, in air (n i = 1) collecting light within a solid angle of angle 2α (its acceptance angle) and sending it to a smaller area receiver Σ immersed in a medium of refractive index n, whose points are illuminated within a solid angle of angle 2β. From the above ...
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