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(a) Microphotograph (×500) of an etched cross section of a single mode (core) (clad) fiber with core diameter 55 μm. The core region shows a uniform microstructure and a smooth core-clad interface.
Far-field pattern of a 2.2 m long (core) (clad) single mode fiber. The solid line is a Gaussian fit, and its width (at the points) corresponded to .
Energy distribution at a distance of 38 mm from the output end of a 2.2 m long (core) (clad) single mode fiber. The distribution width (at the points) was 8.4 mm, corresponding to .
Power collected by an 8 μm diameter tapered tip, as a function of the X, Y position of the tip. The tip scanned a area at the output face of a SMF having core diameter 55 μm.
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