Demonstration of narrowband high-reflectivity Bragg gratings in a novel multimode fiber

Fiber Bragg gratings are important components for a great number of applications including DWDM lightwave systems, fiber lasers, and sensors. A narrowband high-reflectivity response in a multimode fiber could have a dramatic impact on lightwave communication systems and sensors. In this paper, we report what is, to our knowledge, the first demonstration of strong Bragg reflection gratings in a multimode fiber. Using a novel multimode fiber with standard phase mask writing techniques, we have produced gratings with reflectivities of >98% and bandwidths of <0.5 nm at similar to1550 nm in very good agreement with modeling predictions. (C) 2003 Elsevier Science B.V. All rights reserved.