Abstract
It has been shown that the slanted Bragg grating (SBG) is a highly attractive candidate for equalizing the gain spectrum of erbium doped fiber amplifiers (EDFAs).1 This is a standard Bragg grating tilted during photo-inscription with an angle between the grating fringes and the normal of the fiber axis. This makes the grating couple most of the guided mode into radiation modes or cladding modes in a counter-propagating direction. The filter shape is therefore given by the envelope of couplings into the different cladding modes. The SBG exhibits the absence of back-reflection at filtering wavelengths of long period grating and the properties of the grating are as robust as those of standard short period grating in terms of temperature sensitivity and strain.2
© 2002 Optical Society of America
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