✦ LIBER ✦

On high-speed cross-gain modulation without pattern effects in quantum dot semiconductor optical amplifiers

✍ Scribed by A.V. Uskov; J. Mørk; B. Tromborg; T.W. Berg; I. Magnusdottir; E.P. O’Reilly

Publisher: Elsevier Science
Year: 2003
Tongue: English
Weight: 143 KB
Volume: 227
Category: Article
ISSN: 0030-4018
DOI: 10.1016/j.optcom.2003.09.052

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✦ Synopsis

In the regime with maximum linear gain in a quantum dot (QD) semiconductor optical amplifier (SOA), instantaneous gain modulation by change of the photon density is possible due to spectral hole burning effects. This, in turn, leads to the opportunity of ultrafast cross-gain modulation (XGM) without pattern effects at modulation bit-rates much higher than the interband relaxation rate. The maximum bit-rate for this pattern-effect-free XGM grows with increasing pump current density of the QD SOA.

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We have performed cross-gain modulation experiments on semiconductor optical amplifiers with 100 fs pump pulses. Setting the pump on the high energy side of the gain results in a complex transient for the CW probe that is situated at gain maximum. An important part of this transient is shown to be d