Home Forums SYSTEM How to find exact Bias Point in Direct Modulation

How to find exact Bias Point in Direct Modulation

Profile Photo
(joined October 2014)
Participant

Hi every one !
I am trying to find Bias point in Direct Modulation of Rf signal (as Input).

I have used “Directly Modulated Laser measured” component to do direct modulation in one scenario and “Laser measured” component (instead of Directly Modulated Laser measured) to do direct modulation in other scenario.

i tried to find bias point by making 2-d graph between DC input on x-axis and output power from modulator at y-axis.

But problem is that whenever i measure output power Vs all sweep values of input DC, the output power always remain constant. So i am not being able to find proper Bias point due to not getting non-linear graph (as getting constant value of output power).

Can some body help me finding Exact Bias point in Direct Modulation or any other alternative way of finding Bias point in direcct modulation.

I am attaching Fig and Opti sys file of both scenarios as follows.
I am using Opti sys version 7.

P.S the Bias values Shown in both fig r not the only values for which i have check BIAS point.

I wil be thankful to ur kind response.

Best Regards

Responses (6):

Login You must be logged in to reply to this topic.