Yenista Optics OSICS, User Manual, Page: 111 / 252

Using the OSICS ECL Module
OSICS User Manual 111
BKR
TL
S-50
AT
N
DFB
ECL
T10
0
SL
D
SW
T
TLS
-A
G
SW
T
A
PC
MA
IN
9.7.1 Setting Up Digital (TTL) Modulation Using the ECL Module
Internal Source
Subject Digital modulation capabilities of the ECL module is within the 50 Hz–1 MHz frequency
range (see the ECL specifications).
Internal digital modulation uses the ECL module's built-in TTL-level signal generator (see
Figure 71, p. 110 ).
The ECL module’s built-in TTL signal-generator can provide a TTL modulation signal in
the range of 153 Hz–1 MHz, but for optimum modulation performance we recommend
applying modulation frequencies within the specified range of the ECL module.
The resulting modulated optical output signal follows a pattern as shown in the following
figure.
Figure 72: TTL-Modulated Output Power Signal (ECL Module)
Procedure Step 1 – Set the module modulation source to INTERNAL:
1.
Access the ECL Unit Setup menu (see section Accessing an OSICS Module Setup
Menu, p. 33 ).
2. Expand the 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 73: ECL Unit Setup – Modulation Source (Internal)
3. Turn the rotary knob to put the cursor before INTERNAL and press it to validate your
selection.
The ECL
Unit Setup menu is automatically displayed and the modulation is set to the
selected source.
Time Reference
Power Setting
2 x 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.