Figure 2.10 Laser Page Three - ILX Lightwave LDC-3926339 User Manual

9a
9b
10 Enable the photodiode bias.
10a Press the Down soft key (F4) until LAS page 3 is displayed.
10b To turn on Photodiode (PD) Bias parameter, press the INC/DEC keys or use the
11 Press the F1 softkey on any of the three pages of the LAS setup menu to turn on or off the
02_03
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Using the INC/DEC keys, Adjust knob, or keypad, enter the optical power setpoint
value.
The module divides the measured photodiode current by the CalPD value to calculate the
laser optical power. The current source automatically adjusts the laser drive current to
keep the calculated laser power at the Pset value.
Select CalPD and adjust it to the calculated value. If the correct CalPD is not known,
see Setting Constant Photodiode Current Mode (Ipd) on page 20.
The photodiode responsivity, CalPD, is used to convert photodiode current to optical
power of the laser diode.The CalPD units are mA/mW. The correct responsivity value
(CalPD) must be set for the constant power mode to properly operate.
Adjust knob. The PD Bias parameter will toggle between on and off. This setting
controls the 5 volt reverse voltage to the monitor photodiode.

Figure 2.10 Laser Page Three

laser current source.
Also, you can turn on the current source with the F1 soft key from the CHAN menu. The
ON toggle has a two-second delay before the current source is enabled.
O P E R A T I O N S
Operating from the Front Panel
2
C H A P T E R
19
LDC-3926339