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POF Measurement: Far Field

Far Field Measurement

Measuring the far field of an optical fiber involves quantifying the distribution of light at distances from the fiber’s facet much greater than the fiber’s diameter.

Idealized far field measurement setup. Source: POF Handbook.

The far field angle Θmax can be calculated from distances B (edge of fiber core to edge of light distribution) and D (fiber facet to measurement screen). Typically, the edge of the light distrubution in the pattern on the measurement screen is defined as when the relative intensity of the light falls below 5%.

Equation showing the relationship between distances B and D and the far field angle (Θmax).

Using the far field angle, it is possible to calculate the fiber’s numerical aperture.

Equation showing the relationship between the far field angle (Θmax) and the numerical aperture.

A fiber’s far field distribution can be mapped using an array of receptors arranged in a semicircle, centered at the end of the fiber. This way, the amount of light emitted from all angles on a plane can be measured. Normally, the measurement can be assumed to be radially symmetric, but if a three-dimensional map is required, the array can be continuously rotated 180° while taking measurements.

Principle of far field measurement. Source: POF Handbook

References

O. Ziemann et al., POF Handbook. Berlin, Germany: Springer-Verlag Berlin Heidelberg, 2008.

Filed Under: FiberCast Tagged With: Advanced POF Topics, Measurement

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