Using the OSICS DFB Module
OSICS User Manual
91
8.6
Monitoring the OSICS DFB Module Parameters Using the
Analog OUT 1 Output
Subject
The OSICS Mainframe rear panel (see
) features eight channel ports, each of
them is dedicated to a specific channel-slot and identified by its channel number (CH1 to
CH8).
As they are numbered from left to right, channel ports do not face across their
corresponding slots.
Each channel can produce two types of output signals on BNC connectors:
•
OUT 2
: analog signal from the DFB module that you can use as an external
modulation source for other devices. For more details, see section
Module as a Modulation Source for External Devices (OUT 2 Output), p. 90
•
OUT 1
: analog signal for constant monitoring of the DFB laser diode current (I
LD
),
output power (P
OUT
), or laser chip temperature (
θ
).
The scale-factors for the OUT 1 signal are the following (FPGA v.6.00):
•
Laser diode current (I
LD
): 10 V / 300 mA
•
Optical output power (P
OUT
): 10 V / 30 mW
•
Laser chip temperature (
θ
): 0 V = 10°C; 10 V = 45°C
The following procedure explains how to set the OUT 1 analog signal.
Before Starting
Make sure you have an oscilloscope.
Procedure
1.
Access the DFB
Unit Setup
menu (see section
Accessing an OSICS Module Setup
).
2.
Turn the rotary knob to put the cursor before the
Analog out
menu and press the
knob.
The
Analog Out
menu appears and displays the monitoring signal currently active
on the OUT1 connector.
Figure 61: DFB Unit Setup – Analog Out setting
3.
Turn the rotary knob to put the cursor before the parameter you want to monitor and
press it to validate your selection.
The selected parameter is validated and the DFB
Unit Setup
menu is displayed.
4.
To monitor the selected signal, connect your oscilloscope to the
OUT 1
BNC
connector corresponding to the channel slot number of the module.
Main
EXIT
2
3
4
5
6
7
8
DFB Unit Setup - Analog Out
ESCAPE
Analog Out :
Select a new signal.
1
▲
CURRENT
POWER
TEMPERATURE
