We describe a novel tunable optical filter for use in optical-frequency-domain
multiplexed communication systems. The shift in the Bragg condition of a fiber
Bragg grating as a result of magnetically induced circular birefringence is
calculated with coupled-mode theory on the basis of circular states of polarization,
and the values obtained for silica and terbium-doped optical fibers are compared.
© 1997 Optical Society of America
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