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Fiber Bragg gratings have been essential elements in fiber optical communication for more than two decades. Although writing gratings using different inscription methods in step-index fibers has become a standard procedure, femtosecond laser based fabrication of such gratings in specialty fibers such as photonic crystal fibers (PCFs) has proven not to be straightforward. This is due to the presence...
We review the state-of-the-art in photonic crystal fiber (PCF) based mechanical sensing. We then introduce our recently developed highly birefringent PCF that allows pressure and force sensing when combined with a fiber Bragg grating sensor. We clarify the measurement principle and explain how the optimized microstructure of the PCF yields its record-high sensitivity. In addition we demonstrate the...
We studied the influence of the fiber orientation on the growth of fiber Bragg gratings (FBGs) in pure silica microstructured optical fibers (MOFs) during femtosecond UV laser inscription. To do so we simulated the transverse coupling efficiency as a function of the relative angle between the inscribing laser beam and the internal microstructure for hexagonal lattice and highly birefringent MOFs by...
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