Design and realization of long-period grating devices inconventional and high birefringence fibers and their novel applicationsas fiber-optic load sensors

摘要

We report the design and fabrication of long-period fiber gratingsnwith single and cascaded structures in conventional and highnbirefringence (hi-bi) fibers using amplitude mask and point-by-pointnwriting techniques. We also report a novel application of long-periodngratings produced in nonhigh-birefringence fiber as fiber-optic loadnsensors exhibiting very high transverse strain sensitivity. Sensitivitynsome 800 times greater than previously reported fiber Bragg gratingn(FBG) sensors has been achieved