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Laser diode modulation under large signal conditions

Ahmadian, A ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1109/IranianCEE.2013.6599776
  3. Publisher: 2013
  4. Abstract:
  5. Large signal behavior of the Laser Diode is analyzed with the aim of finding a qualitative relationship between modulation amplitude and the change in the shape of its transfer function. It is found that, at quasi-static conditions, increasing the amplitude of the modulating signal smoothes out the original piecewise-linear transfer function of the diode. It further shifts the now smoothed knee point to lower DC currents. As the frequency increases, however, these effects become less and less pronounced. In addition, the transfer function becomes rather wavy due to the failure of current density to reach the saturation level necessary for adequate stimulated emission. At even higher frequencies, carrier density never accumulates in response to short pulses of current. In these conditions the transfer function reverts back to its original shape
  6. Keywords:
  7. Large signal ; Laser Diode ; Transfer function ; Higher frequencies ; Large signal behavior ; Large-signal conditions ; Large-signals ; Modulating signals ; Modulation amplitudes ; Quasi-static conditions ; Saturation levels ; Electrical engineering ; Modulation ; Piecewise linear techniques ; Semiconductor lasers ; Transfer functions
  8. Source: 2013 21st Iranian Conference on Electrical Engineering ; May , 2013 , Page(s): 1 - 5 ; 9781467356343 (ISBN)
  9. URL: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6599776