Controlling the Optical Output of all OSICS Modules Simultaneously
OSICS User Manual
43
4.4.2
Setting Up Digital (TTL) Modulation Using an External Source
Subject
External digital-modulation is achieved by applying a digital signal to the BNC
Mod. In
connector located on the OSICS Mainframe rear panel (see
). This allows
all the modules (or an external device connected to the OSICS Mainframe
Synchro
output connector) to be modulated in a synchronous way by means of an external source.
The OSICS Mainframe distributes the external modulated-signal to all T100, ECL and DFB
installed modules in order to synchronize all modules with a single modulated signal,
amplitude, and frequency.
For optimum stability of the modulated signals, we recommend applying a digital
modulation in the specified range of the modules.
Before Starting
Make sure you have a digital-signal generator.
Procedure
Step 1 – Set the OSICS Mainframe modulation source to EXTERNAL:
1.
Access the
Main Setup
menu (see section
Accessing the OSICS Mainframe Main Setup
).
2.
Enter the
Source
sub-menu as follows:
a. Turn the rotary knob to put the cursor before the
Modulation
menu and press
the knob to expand it.
b. Turn the rotary knob to put the cursor before the
Source
sub-menu and press
the knob to enter it.
The
Modulation source
sub-menu appears and displays the current selected
modulation source.
Figure 19: Main Setup – Modulation Source (External)
3.
Turn the rotary knob to put the cursor before
EXTERNAL
and press it to validate your
selection.
The
Main Setup
menu is automatically displayed and the modulation is set to the
selected source.
Step 2 – Set the TTL-level signal generator:
1.
On the OSICS Mainframe rear panel, connect your external digital signal-generator to
the
Mod. in
BNC connector (see
2.
Apply the TTL signal not exceeding the maximum voltage of +5 V and repetition
frequency between and .
Main
EXIT
1
2
3
4
5
6
7
8
Main Setup - Modulation source
ESCAPE
▲
Modulation source :
INTERNAL
EXTERNAL
Select a new value.
