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Reflection, transmission and loss filters based on fiber Bragg gratings are key components in future wavelength division multiplexing telecommunication networks. A shift of the Bragg wavelength, λB, can be achieved by applying a strain or heating the fiber section containing the grating [1]. Here we report on Bragg grating devices that use a thin metallic coating to directly heat the fiber or a piezoelectric coating to strain it. Such integrated tunable filter devices show DC tuning [2-5] and modulation capabilities with promise for enhanced efficiency, reduced size, and low electrical power consumption.
© 1997 Optical Society of America
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