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.
© 1996 Optical Society of America
Ashish M. Vengsarkar, J. Renee Pedrazzani, Justin B. Judkins, Paul J. Lemaire, Neal S. Bergano, and Carl R. Davidson, "Long-period fiber-grating-based gain equalizers," Opt. Lett. 21, 336-338 (1996)