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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 26, Iss. 11 — Jun. 1, 2008
  • pp: 1498–1509

Time-Resolved Linewidth Enhancement Factors in Quantum Dot and Higher-Dimensional Semiconductor Amplifiers Operating at 1.55 $\mu{\hbox{m}}$

Aaron J. Zilkie, Joachim Meier, Mo Mojahedi, Amr S. Helmy, Philip J. Poole, Pedro Barrios, Daniel Poitras, Thomas J. Rotter, Chi Yang, Andreas Stintz, Kevin J. Malloy, Peter W. E. Smith, and J. Stewart Aitchison

Journal of Lightwave Technology, Vol. 26, Issue 11, pp. 1498-1509 (2008)


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Abstract

We report time-resolved measurements of the linewidth enhancement factors ($\alpha$-factors) $\alpha_{cr}$, $\alpha_{\rm CH}$, and $\alpha_{\rm TPA}$, associated with the adiabatic carrier recovery, carrier heating, and two-photon absorption dynamical processes, respectively, in semiconductor optical amplifiers (SOAs) with different degrees of dimensionality–one InAs/InGaAsP/InP quantum dot (0-D), one InAs/InAlGaAs/InP quantum dash (1-D), and a matching InGaAsP/InGaAsP/InP quantum well (2-D)—all operating near 1.55-$\mu{\hbox{m}}$ wavelengths. We find the lowest $\alpha_{cr}$ values in the QD SOA, 2–10, compared to 8–16 in the QW, and values of $\alpha_{\rm CH}$ and $\alpha_{\rm TPA}$ that are also lower than in the QW. In the QD SOA, the $\alpha$-factors exhibit little wavelength dependence over the gain bandwidth, promising for wide-bandwidth all-optical applications. We also find significant differences in the $\alpha$-factors of lasers with the same structure, due to the differences between gain changes that are induced optically or through the electrical bias. For the lasers we find the QW structure instead has the lower $\alpha$-factor, having implications for directly modulated laser applications.

© 2008 IEEE

Citation
Aaron J. Zilkie, Joachim Meier, Mo Mojahedi, Amr S. Helmy, Philip J. Poole, Pedro Barrios, Daniel Poitras, Thomas J. Rotter, Chi Yang, Andreas Stintz, Kevin J. Malloy, Peter W. E. Smith, and J. Stewart Aitchison, "Time-Resolved Linewidth Enhancement Factors in Quantum Dot and Higher-Dimensional Semiconductor Amplifiers Operating at 1.55 $\mu{\hbox{m}}$," J. Lightwave Technol. 26, 1498-1509 (2008)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-26-11-1498

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