The pumping current of the semiconductor lasers

  1. Hi all,

    I have a question and ask for a discussion. Can the pumping current of the semiconductor lasers such as DFB laser and FP-LD, be smaller than zero?

    Best Regards,
  2. jcsd
  3. berkeman

    Staff: Mentor

    Welcome to the PF.

    What do you mean? By less than zero you mean negative? Do you have some reference links you can post to help us understand your question?
  4. Thanks for your reply. Yes, I mean negative pumping, but within a very small time (0.05ns). Acturally i am doing some numerical modelling and playing the rate equations. The pumping is a source term in the equation. And if we modulate the bias current, which is I_total = I0 + Delta_I * sin(2.0*pi *fm *t), where I0 is the DC part and Delta_I is the A.C. part, fm is the modulation frequency. If fm is very large (20 GHz), can the Delta_I be 3 times the I0 ? I am not familiar with the experiment at all, thus I post this question here for discussion.
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