Abstract
We present the development of superstructure fiber gratings (SFG) in
Ge-doped, silica optical fiber using femtosecond laser inscription. We apply
a simple but extremely effective single step process to inscribe low loss,
sampled gratings with minor polarization dependence. The method results in a
controlled modulated index change with complete suppression of mode coupling
associated with the overlapping LPG structure leading to highly symmetric
superstructure spectra, with the grating reflection well within the Fourier
design limit. The devices are characterized and compared with numerical
modeling by solving Maxwell's equations and calculating the back reflection
spectrum using the bidirectional beam propagation method (BiBPM).
Experimental results validate our numerical analysis, allowing for the
estimation of inscription parameters such as the ac index modulation change,
and the wavelength, position and relative strength of each significant
resonance peak. We also present results on temperature and refractive index
measurements showing potential for sensing
applications.
© 2011 IEEE
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