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Nature of wavelength chirping in directly modulated semiconductor lasers

Nature of wavelength chirping in directly modulated semiconductor lasers

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Published

Relations are derived concerning the inherent connection between frequency deviations and the optical power wave-form of a directly modulated semiconductor laser, providing for the first time a quantitative assessment of inherent optical fibre dispersion penalties of directly modulated lasers. The relations also indicate that control of chirp involves only the control of the intensity modulation characteristics and proper current drive of semiconductor lasers. Experimental measurement of FM and IM characteristics of a 1.55 μm DFB laser support the results.

Inspec keywords: optical modulation;semiconductor junction lasers;laser frequency stability

Other keywords: frequency deviations;current drive;optical power waveform;wavelength chirping;directly modulated semiconductor lasers;inherent optical fibre dispersion penalties;DFB laser;intensity modulation characteristics

Subjects:Laser beam characteristics and interactions;Semiconductor lasers;Laser beam interactions and properties;Lasing action in semiconductors;Laser beam modulation, pulsing and switching; mode locking and tuning

References

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      • C. Harder ,K. Vahala ,A. Yariv.Measurement of the linewidth enhancement factor α of semiconductor lasers. Appl. Phys. Lett., 328 - 330
    2. 2)
      • R.A. Linke.Transient chirping in single frequency lasers: lightwave system consequences. Electron. Lett., 472 - 474
    3. 3)
      • D. Marcuse.Classical derivation of the laser rate equation. IEEE J. Quantum Electron., 228 - 231
    4. 4)
      • C.H. Henry.Theory of the linewidth of semiconductor lasers. IEEE J. Quantum Electron., 259 - 264
    5. 5)
      • Bowers, J.E., Tsang, W.T., Koch, T.L., Olsson, N.A., Logan, R.A.: `Microwave intensity and frequency modulation of ridge-waveguide-type distributed feedback lasers', paper PD-B2, XIII Int. Quant. Electron. Conf., 1984, Anaheim.
http://iet.metastore.ingenta.com/content/journals/10.1049/el_19840709
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