Lightwave Communications LDX-3232 LASerMDI?, Mdi Las Ipd, MDP P PD setpoint would be used

C H A P T E R 4

COMMAND REFERENCE

LDX-3232 Device-Dependent Command Reference

LASer:MDI	FRONT PANEL
	REMOTE

The LASer:MDI command sets the value of the optical power setpoint, in µA, if the CALMD (CAL PD) responsivity is 0.

Syntax Diagram

MDI

: LAS :

IPD

<white

space>

<nrf

value>

Parameters	An <nrf value> that represents the photodiode feedback current, in µA.
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 (PPD, by the CAL PD factor),
	and the MDP (PPD) 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.

LASer:MDI?	FRONT PANEL
	REMOTE

The LASer:MDI? query returns the value of the laser photodetector current measurement in µA.

Syntax Diagram

				MDI
	:	LAS	:	?
				IPD
	- 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.

68 LDX-3232