A new S-band erbium-doped fiber amplifier module with a double-pass configuration based on two circulators has been designed and constructed. The bending losses of a depressed-cladding doped fiber have been exploited to suppress the amplified spontaneous emission in the C band. The experimental characterization of the double-pass amplifier has shown that significant advantages can be obtained with respect to the single-pass configuration.
© 2006 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: June 13, 2006
Revised Manuscript: August 31, 2006
Manuscript Accepted: September 5, 2006
Published: October 26, 2006
Matteo Foroni, Federica Poli, Annamaria Cucinotta, and Stefano Selleri, "S-band depressed-cladding erbium-doped fiber amplifier with double-pass configuration," Opt. Lett. 31, 3228-3230 (2006)