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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 2 — Jan. 16, 2012
  • pp: 1450–1464

Theoretical investigation of injection-locked high modulation bandwidth quantum cascade lasers

Bo Meng and Qi Jie Wang  »View Author Affiliations

Optics Express, Vol. 20, Issue 2, pp. 1450-1464 (2012)

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In this study, we report for the first time to our knowledge theoretical investigation of modulation responses of injection-locked mid-infrared quantum cascade lasers (QCLs) at wavelengths of 4.6 μm and 9 μm, respectively. It is shown through a three-level rate equations model that the direct intensity modulation of QCLs gives the maximum modulation bandwidths of ~7 GHz at 4.6 μm and ~20 GHz at 9 μm. By applying the injection locking scheme, we find that the modulation bandwidths of up to ~30 GHz and ~70 GHz can be achieved for QCLs at 4.6 μm and 9 μm, respectively, with an injection ratio of 5 dB. The result also shows that an ultrawide modulation bandwidth of more than 200 GHz is possible with a 10 dB injection ratio for QCLs at 9 μm. An important characteristic of injection-locked QCLs is the nonexistence of unstable locking region in the locking map, in contrast to their diode laser counterparts. We attribute this to the ultra-short upper laser state lifetimes of QCLs.

© 2012 OSA

OCIS Codes
(060.4080) Fiber optics and optical communications : Modulation
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade

ToC Category:
Lasers and Laser Optics

Original Manuscript: November 15, 2011
Manuscript Accepted: December 1, 2011
Published: January 9, 2012

Bo Meng and Qi Jie Wang, "Theoretical investigation of injection-locked high modulation bandwidth quantum cascade lasers," Opt. Express 20, 1450-1464 (2012)

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