Help!!! AC-coupling for Laser Driver

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Rattapoom Tidprom

Joined Jul 14, 2015
3
I'm starting to understand laser driver (especially Maxim laser driver). I'm having a hard time to understand why we have IL = IBIAS + IMOD/2 when optical high output and IL=IBIAS-IMOD/2 when optical low output. (IBIAS and IMOD are constant current sources). I've also attached the article that you can find the basic details about interfacing with Maxim laser driver.

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#12

Joined Nov 30, 2010
18,216
The bottom, right drawing seems to illustrate why AC coupling causes a +/- effect with the modulating signal. I think you merely overlooked the idea of AC coupling making the modulating signal cause both greater and lesser excursions of the bias current across time.
 

Bordodynov

Joined May 20, 2015
2,745
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