The periodic mode coupling between the LP01 and counterpropagating LP02 modes induced by a reflective fiber grating is investigated by using the coupled-mode theory. The properties of the mode conversion by the reflective fiber grating are compared with those by a transmissive grating that couples LP01 and LP02 modes in a same direction. Our results show that the former has a narrower power conversion spectrum than the latter.
© 1992 Optical Society of America
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