Abstract
We report on the writing of ultrabroadband Fiber Bragg Gratings in standard telecom fibers by the use of a highly chirped first-order phase-mask in conjunction with infrared femtosecond pulses. A high reflectivity (99%) and high chirp rate (95nm/cm) filter providing a wavelength coverage of five telecom bands (E+S+C+L+U) is demonstrated over a single 35mm long grating obtained following an exposure time of only 30s in a H2-loaded SMF-28 fiber segment. This report paves the way to the development of new broadband fiber-based optical components with unique features able to provide large bandwidths and low-losses.
© 2009 Optical Society of America
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