Reduction of harmonic distortion in injection-locked semiconductor lasers

S. K. Hwang, J. M. Liu, J. K. White

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


The characteristics of the second harmonic distortion (SHD) and the third harmonic distortion (THD) are experimentally investigated in a semiconductor laser subject to external optical injection. Compared with the free-running laser, both SHD and THD in the injection-locked semiconductor laser are observed to reduce significantly and equally for a large range of modulation power at a modulation frequency of 5 GHz, which are 15-dB and 23-dB decreased, respectively. At a fixed modulation power of 6 dBm, the reduction of SHD and THD is, however, found to vary with modulation frequency. The reduction of SHD is more substantial at around one-half of the relaxation resonance frequency of the free-running laser. The decrease in THD is, however, more significant at around one-half and one-third of the relaxation resonance frequency of the free-running laser. The reduction in harmonic distortions is also found to vary with the operational parameters of the injection signal. The reduction of SHD increases with the decreasing injection strength and the negatively decreasing detuning frequency, while that of THD shows a completely opposite behavior.

Original languageEnglish
Article number10
Pages (from-to)88-97
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Issue numberPART 1
Publication statusPublished - 2004 Dec 1
EventPhotonics North 2004: International Conference on Applications of Photonic Technology, ICAPT - Ottawa, Ont., Canada
Duration: 2004 Sep 262004 Sep 29

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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