O-Band Tunable Laser Source
Chapter 7: Trigger and Sync Clock Outputs
Rev B, April 20, 2022
Page 14
Trigger and Sync Clock Outputs
These BNC (Female) outputs are found on the back of the unit as shown here:
7.1. Trigger Output
The Trigger Out connector (BNC) provides a signal for synchronizing the sweep functions with external
equipment. The port normally is held at 0 V. It is used for both Stepped Sweep and Continuous Sweep modes.
Stepped Sweep Mode
:
In this mode, the Trigger Output provides a 4.1 V pulse when the laser steps to the next wavelength. The rising
edge indicates the beginning of the transition to the next wavelength, then 300 ms later, the falling edge indicates
the laser is stable at the new wavelength. In the example shown below, the laser is set to step from 1300 nm to
1304 nm in 1 nm increments and 1 sec dwell times. Note that the transition times (300 ms) are not included in the
dwell times.
Continuous Sweep Mode
:
In this mode, the Trigger Output provides a 4.1 V rising edge at the beginning of the sweep, and a falling edge back
to 0 V at the end of the sweep. The signal stays at 0 V while the laser resets to the starting wavelength. See the
next section on Clock Sync Output for a more detailed description of the signals.