Abstract
The interference fringes formed in a long-period fiber grating pair are
sensitive to the loss in the cladding mode, which can be induced by bending
or by coating on the fiber. Assuming that there is no loss and that both gratings
are identical, the interference fringes are shown to have 100% contrast when
each grating has 50% transmissivity. By contrast, if the cladding mode is
absorbed or scattered the fringe contrast is shown to be degraded. The spectral
behaviors of a long-period fiber grating pair with loss is analyzed by the
coupled-mode theory and is compared with experimental results.
© 1998 Optical Society of America
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