Long-period gratings were fabricated in standard telecommunication fiber (Corning SMF-28) by use of what is believed to be record short-wavelength light from a 157-nm F<sub>2</sub> laser. Strong loss peaks were formed without the need for enhancement techniques such as hydrogen loading. The magnitude of the attenuation peak was sensitive to the single-pulse laser fluence, decreasing with increasing pulse fluence as a result of nonuniform 157-nm laser interaction with both the fiber cladding and core. The long-period fiber gratings have good wavelength stability (Δλ~7 nm) under thermal annealing at 150 °C.
© 2001 Optical Society of America
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(220.4610) Optical design and fabrication : Optical fabrication
Kevin P. Chen, Peter R. Herman, Jie Zhang, and Robin Tam, "Fabrication of strong long-period gratings in hydrogen-free fibers with 157-nm F2-laser radiation," Opt. Lett. 26, 771-773 (2001)