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Directly modulated laser spectrum explaination

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hula

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modulated laser spectrum

Hi,

Initially I've generated an unmodulated (power against frequency) spectrum, using a simulation software.

Now, I'm trying to generate the spectrum of a directly modulated laser.

This is done by changing the default values of the laser module LaserRateEqSM. The parameters to be change are "BiasToThreshold" and "ModulToThreshold".

Does anyone knows what's the meaning of "BiasToThreshold" and "ModulToThreshold"? And how the change in values of these 2 parameters will affect the spectrum of the directly modulated laser?

Thanks.
 

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