Section 3. Operation Instructions:
3.1
Getting Started
Unpacking
Inspect FPS-003 for any physical damage due to shipping/transportation. Contact carrier
if any damage is found. Check the packing list to see if any parts or accessories are
missing.
Initial setup
1.
Before connecting to the FPS-003, set up the input signal parameters on the
piezo driver. Make sure that the output voltage is not negative and does not
150V. With the piezo driver powered off, connect the piezo driver to
the FPS-003 electrical cable. Make sure that the polarity is correct.
2.
Connect input and output fibers to FPS-003. It is important to clean the fiber
connectors using industry standard procedures before connecting them. Make
sure that the light source is turned off during connector cleaning.
3.
Turn on the light source and power on the piezo driver.
Note: For interferometric applications, make sure that all fibers are fixed in
position and cannot move during measurement. This can be done by taping
them to the optical table.
3.2
Operation
The FPS-003 uses a piezo with a capacitance of about 8
nF (see test data for exact value).
The drive signal source can vary depending on the required phase shift and drive
frequency. For small phase shifts (a few
π
), a function generator can be used as the drive
signal source. To use the full range of the phase shifter, the drive signal source should be
able to provide a sine wave drive signal with a peak-to-peak voltage of up to 150V, at a
bandwidth of 60 kHz.
1.
Never apply a voltage higher than 150V to the FPS-003. Do not apply a
negative input voltage to the FPS-003.
2.
Adjust the piezo driver voltage to achieve the desired delay at the desired
modulation frequency. See Figure 3 to Figure 5 for typical performance data
for FPS-003s with different types of fiber.
3.
Turn off the electrical drive signal and light source when the FPS-003 is not in
use.
Document #: GP-IN-FPS-003-10
Page 7 of 9
