Abstract

We demonstrate group velocity dispersion (GVD) and dispersion slope (DS) compensation devices based on enhanced thermal chirping of glued fiber Bragg gratings (FBGs). By gluing a uniform FBG onto a uniform Zn channel for the GVD compensator and a linearly tapered Zn channel for the DS compensator, the thermal sensitivity of the FBG is enhanced. The thermal chirping of the FBG is given by the thermal expansion of a Zn channel, the thermooptic effect, and the thermal expansion of the optical fiber. Controlling the temperature distributions of the uniform FBG performs the tuning of GVD and/or DS, as well as their center wavelengths. These compensation devices can tune their GVD or DS while maintaining a constant center wavelength and change their center wavelengths while preserving constant GVD or DS values. The GVD can be tuned from -123.39 to -57.29 ps/nm with the center wavelength at 1552.9 nm, while the center wavelength can be shifted 2.2 nm with a GVD value of about -105 ps/nm. On the other hand, the DS can be tuned from -8.88 to -24.44 ps/nm<sup>2</sup> with the center wavelength at 1554.5 nm, while the center wavelength can be shifted 0.6 nm with a DS value of about -10.4 ps/nm<sup>2</sup>.

© 2007 IEEE

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