Illumination, tilts and offsets

20-2 Fields at the endface 20-3 Fields of the illuminating beam 20-4 Gaussian and uniform beams 20-5 Modal amplitudes and power 

20-6 Example On-axis Gaussian beam 20-7 Example Tilted Gaussian beam 20-8 Example Offset Gaussian beam 20-9 Example On-axis uniform beam 20-10 Example Oblique plane wave 

20-12 Example Tilted uniform beam 20-13 Example On-axis uniform beam 20-14 Comparison with geometric optics 

20-15 Example Infinite parabolic profile 20-16 Example Gaussian approximation 

In earlier chapters we established the properties of bound modes and showed 420 

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Fig. 20-2 (a) Coordinates for describing the fields of the beam incident on the endface and (b) the fraction of total power of a Gaussian beam entering the modes of an infinite parabolic-profile fiber as a function of the tilt angle 0.. The orientation of the Gaussian beam is shown for (c) on-axis, (d) tilted and (e) offset illumination. 

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