Using the OSICS DFB Module
OSICS User Manual
75
8.5.1
Setting Up Digital (TTL) Modulation Using the DFB Module
Internal Source
Subject
Digital modulation capabilities of the DFB module is within the 1 Hz–890 kHz frequency
range (see the DFB specifications).
Internal digital modulation uses the DFB module's built-in TTL-level signal generator (see
).
The DFB module’s built-in TTL signal-generator can provide a TTL modulation signal in
the range of 1 Hz–555 kHz.
The resulting modulated optical output signal follows a pattern as shown in the following
figure.
Figure 42: TTL-Modulated Output Power Signal (DFB Module)
Procedure
Step 1 – Set the module modulation source to INTERNAL:
1.
Access the DFB
Unit Setup
menu (see section
Accessing an OSICS Module Setup
).
2.
Expand the
TTL Modulation
menu and enter the
Source
sub-menu.
The
Modulation source
sub-menu appears and the cursor automatically points to
the current modulation source setting.
Figure 43: DFB Unit Setup – Modulation Source (Internal)
3.
Turn the rotary knob to put the cursor before
INTERNAL
and press it to validate your
selection.
The DFB
Unit Setup
menu is automatically displayed and the modulation is set to the
selected source.
Time Reference
Power Setting
Optical Output
Power
Main
EXIT
1
2
3
4
5
6
7
8
Unit Setup - Modulation source
ESCAPE
▲
Modulation source :
INTERNAL
MAINFRAME
Select a new value.
