General Photonics FPS-003 Quick start guide
Table of Contents:
CAUTION........................................................................................................................... 3
Section 1. Specifications:.................................................................................................. 4
Section 2. Overview........................................................................................................... 5
Section 3. Operation Instructions:................................................................................... 7
3.1 Getting Started.................................................................................................. 7
3.2 Operation........................................................................................................... 7
Section 4. Technical Support ........................................................................................... 9
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CAUTION
1. Make sure that the polarity of the connection between the piezo driver and the
FPS-003 electrical input is correct. Do not apply a negative voltage to the piezo.
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Section 1. Specifications:
Wavelengths 1310/1550, 1060, or 780nm
Fiber Type
1310/1550nm: Corning ClearCurve ZBL or equivalent
1060nm: 980-1550nm fiber with MFD 5µm at 980nm
780nm: Nufern 780HP or equivalent
Insertion Loss <0.5 dB (at λc, excluding connectors)
Return Loss >55 dB (excluding connectors)
Total Phase Shift
@500Hz, Vpp=150V >55π(at 1550nm)
Half Wave Voltage (Vπ)
@500Hz 1-3V typical
Resonance Frequency 36-39kHz typical
Vπ@resonance
frequency <150mV typical
PDL <0.05 dB at 1550nm
Residual Amplitude
Modulation ±0.01 dB (at 1550nm)
Capacitance of Piezo 5-12 nF
Maximum Applied
Voltage 150V
Drive Frequency Range 0-60 kHz
Electrical Interface Molex WM9131-ND or equivalent
Operation Temperature 10 to 50° C
Storage temperature −40° to 85° C
Total Fiber Length 500 ±10 cm
Dimensions 31.0 (L) x 31.0 (W) x 14.5 (H) mm
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Section 2. Overview
The FPS-003 is a high speed phase shifter specially designed with an operating frequency
range of 0 to 60 kHz. In addition, it has a low Vπboth at resonance and off-resonance, so
that it can be driven with a standard function generator to achieve phase shifts of a few π,
or with a high voltage driver for larger phase shifts. It has an off-resonance phase shift
range of up to 55π.
The device is piezo driven, and the phase shift is achieved by stretching the fiber. Since
the complete optical path is in fiber, the insertion loss and back reflections are low, and
different types of fiber are available for different applications.
Figure 1 FPS-003 phase shifter
2.1 Electrical Interface
Electrical Interface: Ribbon cable with 4-pin connector
Electrical Connector: Molex WM9131-ND or equivalent
Mating Connector: Molex WM4802-ND or equivalent
Electrical connector pinout:
Pin1
Pin 2
Pin 3
Pin 4
Pin Function
1 Positive
2 Not in use
3 Negative
4 Case
Pin 1 is marked with a triangle on the connector.
2.2 Optical Interface
The FPS-003 has 2 fiber pigtails for the input and output signals. Input and output are
interchangeable.
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2.3 Mechanical Dimensions
Figure 2 Mechanical dimensions of FPS-003, in mm
Figure 2 shows the mechanical dimensions of the FPS-003, including the size and
locations of mounting holes.
For bottom mounting (screws inserted upwards from the bottom), use 5 #4-40 UNC L1/4
screws. The mounting holes used are the 4 corner holes (2 through holes and 2 blind
holes) and one in the center.
For top mounting (screws inserted downwards from the top), use 3 #2-56 UNC L5/16
screws. The mounting holes used are the two corner through holes and the center hole.
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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
exceed +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.
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Figure 3 Typical performance data for 1310/1550nm SM FPS-003 (tested at 1550nm).
Figure 4 Typical performance data for 1060nm SM FPS-003 (tested at 1064nm).
Figure 5 Typical performance data for 780nm SM FPS-003 (tested at 1064nm).
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Section 4. Technical Support
The FPS-003 can be serviced only by manufacturer authorized personnel. There are no
user serviceable components in this system.
General Photonics is committed to high quality standards and customer satisfaction. For
any questions regarding the quality and the use of the FPS-003, or future suggestions,
please contact General Photonics Corporation at (909)-590-5473 (telephone) or (909)-
respond to all customer questions within 24 hours during regular business hours. You can
also write to:
General Photonics
5228 Edison Avenue
Chino, California 91710
USA
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