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We introduce new fiber grating devices, called here all-fiber drop-pass filters. Excellent controllability of the relative drop and pass power and wavelength tunability for the drop-pass filters, which consist of an all-fiber Mach-Zehnder interferometer (MZI), a phase controller and one or two fiber gratings, have been demonstrated. The experimental data on the relative drop and pass power at different phases agree well with the theoretical values.
Date of Publication: April 1998