Numéro |
J. Phys. IV France
Volume 12, Numéro 5, June 2002
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Page(s) | 187 - 188 | |
DOI | https://doi.org/10.1051/jp4:20020127 |
J. Phys. IV France 12 (2002) Pr5-187
DOI: 10.1051/jp4:20020127
Evolution of ultra-short optical pulses in active DFB waveguides
J. Chi1, A. Als2 and Z.F. Ghassemlooy21 École Nationale d'Ingénieurs de Brest, BP. 15, 29608 Brest cedex, France
2 Sheffield Hallam University, School of Engineering, Group OCR, Sheffield S1 1WB, U.K.
Abstract
We present a time-domain study on propagation of pico-second optical pulses in active semiconductor waveguides embedded with
a Bragg grating. The nonlinear effects of gain saturation, limited carrier lifetime, as well as linewidth enhancement factor
are taken into account. It is theoretically shown that the effective group velocity can be significantly enhanced by the grating,
resulting in the so-called superluminal transmission. Moreover, the pulse propagation and reflection behaviors are greatly
influenced by such parameters as Bragg coupling strength and optical gain in the waveguide.
© EDP Sciences 2002