Long-period fiber gratings are used to flatten 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
Original Manuscript: October 4, 1995
Published: March 1, 1996
Ashish M. Vengsarkar, Neal S. Bergano, Carl R. Davidson, J. Renee Pedrazzani, Justin B. Judkins, and Paul J. Lemaire, "Long-period fiber-grating-based gain equalizers," Opt. Lett. 21, 336-338 (1996)