Laser:mdi – Lightwave Communications LDX-3232 User Manual
Page 84
C O M M A N D R E F E R E N C E
LDX-3232 Device-Dependent Command Reference
68
LDX-3232
C H A P T E R
4
The LASer:MDI command sets the value of the optical power setpoint, in µA, if the
CALMD (CAL PD) responsivity is 0.
Syntax Diagram
Parameters
An
Notes
If the CALMD (CAL PD) parameter is not set to 0, the LAS:MDI value will not be used. In
this case, the measured MDI would be converted to MDP (P
PD
, by the CAL PD factor),
and the MDP (P
PD
) setpoint would be used.
Examples
"Las:Mdi 40" -action: The LASER output is controlled so that the photodiode feedback
current remains constant at 40 µA.
"Laser:MDI 200" -action: The LASER output is controlled so that the photodiode
feedback current remains constant at 200 µA.
The LASer:MDI? query returns the value of the laser photodetector current measurement
in µA.
Syntax Diagram
- where the response is the most recent LASER monitor current measurement.
Notes
The response is in µA. The response is valid, even when the unit is not in constant P
mode.
This measurement is updated approximately once every 600 ms.
Examples
"Las:Mode:MDP; Las:Calmd 0; Las:MDi?" -response: 100.0, means 100 µA of
photodetector current. This feedback is controlling the laser current output.
"LAS:MODE:IHBW; LAS:MDI?" -response: 20.0, means 20 µA of photodetector current,
but photodiode monitor current is not controlling the laser output current.
LASer:MDI
F
RONT
P
ANEL
R
EMOTE
LASer:MDI?
F
RONT
P
ANEL
R
EMOTE
space> value> : : MDI IPD LAS : LAS MDI : ? IPD