Ultrafast nonlinearities and gain dynamics in high-power semiconductor amplifiers

Motamedi, Ali R.; Plant, Jason J.; Donnelly, Joseph P.; Juodawlkis, Paul W.; Ippen, Erich P.
December 2008
Applied Physics Letters;12/22/2008, Vol. 93 Issue 25, p251106
Academic Journal
The limits imposed by two-photon absorption and free-carrier absorption on the gain and output powers of an InGaAsP/InP slab-coupled optical waveguide amplifier with a confinement factor of Γ=0.5% were studied. The two-photon absorption coefficient and the induced free-carrier absorption cross section were measured to be 65 cm/GW and 7×10-17 cm2, respectively. The effects of two-photon absorption begin to limit the gain significantly for pulses shorter than 40 ps. The carrier recovery times were observed to vary between 390 and 160 ps for 1–4 A bias currents, and the short-pulse saturation fluence of the gain was determined to be 1.4 mJ/cm2.


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