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Tunability of fiber Bragg grating (FBG) in transition region is used to implement wavelength-selective optical intensity modulator, which superimposes a secondary low-speed data on the transit high-speed payload optical signal. Theoretical model of the device is developed and verified by measurements in the linear and nonlinear slopes of the FBG. Experiments with strong and relatively weak gratings confirm the wavelength-selectivity and stability of modulation. The fiber-based modulator is employed for optically tagging or labeling individual wavelength channels using baseband and amplitude-shift keying (ASK) modulated signals. The wavelength- selective channel labeling scheme is useful for the control and management of the optical circuits and services in WDM networks.

TRANSITION REGION EFFECTS IN TUNABLE FIBER-BASED WAVELENGTH-SELECTIVE DEVICES