LDM9T
Chapter 4: Setup
Rev G, Jan 22, 2017
Page 5
Setup
4.1. Setup Instructions
•
Unpack the laser mount and remove the four 2-56 socket head screws
from the top cover using a 5/64" hex driver.
•
Remove the two 2-56 socket head screws securing the Ø9 mm flange to
the copper cold plate with a 5/64" hex driver.
•
Determine the laser pin configuration from the laser diode
manufacturer’s data sheets and set the LD (Laser Diode) and PD
(Photodiode) switches on the inside of the LDM9T.
Figure 2 Polarity Switch Settings
•
The four sockets comprising the laser diode connector are through-hole-
type sockets.
•
Most laser diodes are three pins with the case tied to one of the laser
pins and also to one of the photodiode pins. The other laser and
photodiode pin will be isolated from the case. The LDM9T was designed
to operate the laser case at ground potential therefore this common pin
will be inserted into either the 9 o’clock or the 3 o’clock position of the
laser connector, marked G (Ground). Locate the isolated laser pin and
insert it in the 6 o’clock position, marked LD. The isolated photodiode
should now be in the 12 o’clock position, marked PD.
Figure 3 Laser Diode Socket
