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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 2 — Jan. 27, 2014
  • pp: 1726–1734

Modulation response of a long-cavity, gain-levered quantum-dot semiconductor laser

Michael Pochet, Nicholas G. Usechak, John Schmidt, and Luke F. Lester  »View Author Affiliations

Optics Express, Vol. 22, Issue 2, pp. 1726-1734 (2014)

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The gain-lever effect enhances the modulation efficiency of a semiconductor laser when compared to modulating the entire laser. This technique is investigated in a long-cavity multi-section quantum-dot laser where the length of the modulation section is varied to achieve 14:2, 15:1 and 0:16 gain-to-modulation section ratios. In this work, the gain-levered modulation configuration resulted in an increase in modulation efficiency by as much as 16 dB. This investigation also found that the 3-dB modulation bandwidth and modulation efficiency are dependent on the modulation section length of the device, indicating the existence of an optimal gain-to-modulation section ratio. The long cavity length of the multi-section laser yielded a distinctive case where characteristics of both the gain-lever effect and spatial effects are observed in the modulation response. Here, spatial effects within the cavity dominated the small-signal modulation response close to and above the cavity’s free-spectral range frequency, whereas the gain-lever effect influenced the modulation response throughout the entirety of the response.

© 2014 Optical Society of America

OCIS Codes
(060.4080) Fiber optics and optical communications : Modulation
(140.5960) Lasers and laser optics : Semiconductor lasers
(230.5590) Optical devices : Quantum-well, -wire and -dot devices

ToC Category:
Lasers and Laser Optics

Original Manuscript: August 19, 2013
Revised Manuscript: November 6, 2013
Manuscript Accepted: January 8, 2014
Published: January 17, 2014

Michael Pochet, Nicholas G. Usechak, John Schmidt, and Luke F. Lester, "Modulation response of a long-cavity, gain-levered quantum-dot semiconductor laser," Opt. Express 22, 1726-1734 (2014)

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