Abstract
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.
Highlights
Fiber Bragg gratings (FBG’s) are currently used in sensing and optical communication systems
In this Letter we demonstrate the ability to implement tunable optical filters that use such devices. These new tunable optical filters are based on the Bragg-condition shift of a fiber-optic Bragg grating without linear birefringence[3] perturbed by variable magnetic fields
When a magnetic f ield is applied to a FBG, the circular birefringences n11f, n21f and n12f, n22f are induced in layers 1 and 2, respectively, of that FBG (Fig. 1)
Summary
Fiber Bragg gratings (FBG’s) are currently used in sensing (strain and temperature,[1] magnetic field2) and optical communication systems. These new tunable optical filters are based on the Bragg-condition shift of a fiber-optic Bragg grating without linear birefringence[3] perturbed by variable magnetic fields. An electromagnetic f ield in anisotropic single-mode fibers (perturbed systems) can be represented as a linear combination of round-core f iber (unperturbedsystem) fields[4] by
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