Polarization-dependent carrier dynamics in a passive InAs/InP quantum dot waveguide

We investigate carrier dynamics in a passive InAs/InP quantum dot (QD) waveguide using 255fs optical pulses at a central wavelength of 1568nm. We observe strong anisotropy of absorption saturation for different polarizations. Pump–probe measurements indicate the presence of carrier relaxation dynami...

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Bibliographic Details
Published in:Optics communications 2006-03, Vol.259 (2), p.861-867
Main Authors: Ju, H., Vázquez, J. Molina, Li, Z., Nötzel, R., de Vries, T., Lenstra, D., Gong, Q., van Veldhoven, P.J., Wolter, J.H., Khoe, G.D., Dorren, H.J.S.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Lasers
Nonlinear optics
Optical susceptibility, hyperpolarizability
Optics
Physics
Semiconductor lasers
laser diodes
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Summary:We investigate carrier dynamics in a passive InAs/InP quantum dot (QD) waveguide using 255fs optical pulses at a central wavelength of 1568nm. We observe strong anisotropy of absorption saturation for different polarizations. Pump–probe measurements indicate the presence of carrier relaxation dynamics on a timescale in the order of tens of picoseconds due to cascaded relaxation of carriers generated by two-photon absorption (TPA) from the bulk region to the QDs via the wetting layer. These relaxation timescales are much longer than in QD amplifiers. Our observations are supported by a rate-equation model which includes TPA, showing good agreement with the pump–probe measurements.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2005.09.058