Toptica FemtoFiber pro IR, Manual, Page: 72 / 108

FemtoFiber
®
pro Laser System
Page 68
Status: 6.9.18
6.3.3.2 PHD 110 Module (Phase Detector)
Figure 58 Front panel of the PHD 110 module
The PHD 110 comprises an analog phase detector, which compares the instantaneous phase angles of
two radio frequency signals (RF1 and RF2). The output voltage of the phase detector is proportional to
the relative phase difference between the two input signals. The output is used as an error signal and fed
to the PID regulator. In addition, the PHD 110 module hands over information such as the signal level of
RF1 and RF2, the instantaneous phase deviation and the RMS phase jitter to the measurement unit
MB 110.
Connections:
• Connect the first radio frequency input (RF1) to the Monitor SMA-connector at the FemtoFiber®
pro laser head. Use the supplied coaxial cable with SMA/SMA connectors.
• Connect the second radio frequency input (RF2) to your existing reference oscillator.
• Using the supplied ribbon cable (D-SUB25 connectors), connect the PHD 110 module to the
MB 110 module.
• Connect the Phase Output (
Φ
out
) BNC-connector to the Photo Detect Input of the PID 110 mod-
ule. Use the supplied BNC to D-SUB9 converter cable.
• Close the Phase Difference Input (
∆ Φ
in
) by the 50
Ω
terminator if this input is not needed.