Efficient inscription of Bragg gratings in As2S3 fibers using near bandgap light
Efficient inscription of Bragg gratings in As2S3 fibers using near bandgap light L. E. Zou,1,2,* I. V. Kabakova,2E. C. Mägi,2E. Li,2C. Florea,3I. D. Aggarwal,3 B. Shaw,4J. S. Sanghera,4and B. J. Eggleton2 1Department of Physics, Nanchang University, Nanchang 330031, China 2Center for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), Institute of Photonics and Optical Sciences (IPOS), School of Physics, University of Sydney, NSW, 2006, Australia 3Sotera Defense Solutions, Annapolis Junction, Maryland 20701, USA 4U.S. Naval Research Laboratory, Washington DC 20375, USA *Corresponding author: Linerzou@gmail.com Received May 31, 2013; revised July 7, 2013; accepted July 17, 2013; posted July 18, 2013 (Doc. ID 191549); published September 24, 2013 Efficient inscription of Fiber Bragg gratings (FBGs) in single-mode, thin cladding As2S3fibers is demonstrated by using near bandgap light at 532 nm. The FBGs with the reflectivity of over 80% can be induced in only 80-90 s, substantially faster than in previous reports. The dynamics of the grating growth are investigated in the photosen- sitivity process, showing a fast blue shift of the Bragg wavelength and then a somewhat slower red shift. The aging of the grating after fabrication is also reported, indicating a 37% decay of the grating strength.