title: Fast gain recovery rates with strong wavelength dependence in a non-linear SOA.
abstract: We report remarkably fast and strongly wavelength-dependent gain recovery in a single SOA without the aid of an offset filter. Full gain recovery times as short as 9 ps were observed in pump-probe measurements when pumping to the blue wavelength side of a continuous wave probe, in contrast to times of 25 to 30 ps when pumping to the red wavelength side. Experimental and numerical analysis indicate that the long effective length and high gain led to deep saturation of the second half of the SOA by the probe. The consequent absorption of blue-shifted pump pulses in this region resulted in device dynamics analogous to those of the Turbo-Switch.
authors.affiliation: Photonic Systems Group, Tyndall National Institute, Lee Maltings, Cork, Ireland. ciaran.cleary@tyndall.ie
authors.forename: Ciaran S
authors.initials: CS
authors.lastname: Cleary
authors.forename: Mark J
authors.initials: MJ
authors.lastname: Power
authors.forename: Simon
authors.initials: S
authors.lastname: Schneider
authors.forename: Roderick P
authors.initials: RP
authors.lastname: Webb
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Manning
mesh_terms: D000669:Amplifiers, Electronic; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D055096:Optical Devices; D012666:Semiconductors; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*