Laser Diode Power
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laser diode and threshold currents?
A laser diode has a threshold current of 10 mA and a slope of its optical power versus input current of 2 mW/mA. The diode current is I = A + B sinω t . how do i solve this so that i could plot the output power as a function of time if A = 20 mA, and B = 2 mA.
This appears to be quite straightforward
I = A + B sin ωt
where,
A = 20 mA = 0.02A
B = 2 mA = 0.002A
P/I = 2 mW/mA = 2 W/A
thus...
I = 0.02A + 0.002A sin ωt
and the current bias of this function meets the required 10 mA threshold current
Converting to power
P = ( 2 W/A )( 0.02A + 0.002A sin ωt )
P = 0.04W + 0.004W sin ωt
or in mW...
P = 40mW + 4mW sin ωt
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