Long-period fiber-grating-based gain equalizers

Opt Lett. 1996 Mar 1;21(5):336-8. doi: 10.1364/ol.21.000336.

Abstract

Long-period fiber gratings are used to f latten the gain spectrum of erbium-doped fiber amplifiers. A broadband amplifier with <0.2-dB gain variation over 30 nm is presented. We also show that a chain of amplifiers can be equalized, leading to a bandwidth enhancement by a factor of 3.