Lobo, A.E.
Besley, J.A.
de Sterke, C.M.
Centre for Ultrahigh Bandwidth Devices for Opt. Syst., Univ. of Sydney, NSW, Australia
This paper appears in: Lightwave Technology, Journal of Publication Date: Sept. 2003
Volume: 21
,
Issue: 9
On page(s):
2084
- 2088
ISSN: 0733-8724
Digital Object Identifier: 10.1109/JLT.2003.816824
Current Version Published: 2003-09-08
Abstract
We present a method for designing gain-flattening filters using rotationally symmetric crossed gratings. This involves adjusting the fiber and grating parameters to obtain desirable coupling interactions between the forward-propagating core mode and the backward-propagating cladding modes. A chirped grating with an optimized envelope of the grating strength with axial position is then used to obtain an appropriate transmission spectrum. Here, we demonstrate that the gain spectrum of a typical erbium-doped fiber amplifier could be equalized using this method. The main advantages of this type of grating are its polarization insensitivity and low back reflection.
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