Abstract
Petermann’s recent definition of mode-field radius1 is an important parameter for the specification of single-mode fiber since both waveguide dispersion and joint losses for small lateral offsets depend on it.2 In addition. because it does not rely on force fitting the fields to a Gaussian approximation, this definition can be used for fibers whose field distributions deviate strongly from the Gaussian form. Recently. it was shown3 that the far-field rms width depends directly on the first derivative of the far-field power (through a circular aperture) with respect to acceptance angle, namely,
© 1986 Optical Society of America
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