Observation of dark-pulse formation in gain-clamped semiconductor optical amplifiers by cross-gain modulation
We have measured the ultrafast simultaneous cross-gain and laser mode dynamics in a gain-clamped semiconductor amplifier perturbed by an intense detuned 150 fs pump pulse. Besides relaxation oscillations, we demonstrate the instantaneous formation of a dark pulse in the laser mode that repeats itself with a period given by the cavity round-trip time. The dark pulse sequence subsequently decays into two-mode beating and is shown to weakly cross modulate the amplifier gain. To describe dark-pulse formation a time- and spatially dependent model based on rate equations is necessary. The experimental results are in reasonable agreement with numerical simulations. (C) 1999 American Institute of Physics. [S0003-6951(99)02750-3].
Ecole Polytech Fed Lausanne, Inst Micro & Optoelect, Swiss Fed Inst Technol, Dept Phys, CH-1015 Lausanne, Switzerland. Alcatel Corp Res Ctr, Grp Interet Econ, OPTO, F-91460 Marcoussis, France. Selbmann, PE, Ecole Polytech Fed Lausanne, Inst Micro & Optoelect, Swiss Fed Inst Technol, Dept Phys, CH-1015 Lausanne, Switzerland.
ISI Document Delivery No.: 265KF
Times Cited: 7
Cited Reference Count: 7
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Record created on 2007-08-31, modified on 2016-08-08