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Example of a typical co-propagating pump-probe trace. and are the initial changes in probe transmission due to carrier density depletion and carrier heating, respectively.
(a) Counter-propagating pump-probe traces measured at bias for input pulses at wavelength, with energies of 70(I), 170(II), and 700(III) fJ. (b) Calculated counter-propagating pump-probe traces for a range of different pump pulse energies using the model. corresponds to the input pulse energy for which the device gain drops with respect to its small-signal value. The solid black thin lines in (a) and (b) show the fittings using Eq. (4).
Gain per slice as the pump propagates along the length of the SOA, calculated for the same range of input pulse energies (in units of ) as in Fig. 2(b).
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