Abstract
The asymmetry of the UV-induced refractive-index profile in
photosensitive optical fibers causes a deformation of the modal fields,
resulting in transition losses between UV-exposed and unexposed fiber
sections up to 0.1 dB for UV-induced index changes of the order of
≤10-2. A numerical analysis of the transition losses
is developed. It is verified experimentally that the loss is caused
by coupling of power of the fundamental mode to cladding modes at such
a transition.
© 2000 Optical Society of America
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