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The pumping current of the semiconductor lasers 
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#1
Jul1614, 09:11 PM

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Hi all,
I have a question and ask for a discussion. Can the pumping current of the semiconductor lasers such as DFB laser and FPLD, be smaller than zero? Best Regards, Jason.galq 


#2
Jul1614, 11:32 PM

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P: 40,730

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? 


#3
Jul1714, 12:54 AM

P: 2

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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