General Photonics FPS-002 Quick start guide

FPS-002
Fiber Phase Shifter
Instruction Note
Version 1.1
May 9, 2018
General Photonics Corp. Ph: [phone]
14351 Pipeline Ave. Fax: [phone]
Chino, CA 91710 USA www.generalphotonics.com
Document #: GP-IN-FPS-002-11 Page 1 of 9

Table of Contents:
SAFETY NOTES................................................................................................................ 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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SAFETY NOTES
1. The drive voltage for the FPS-002 can be up to 150V. Be careful when using high
voltages. Never touch the cable or connector when electrical power is on. Make
sure that the power is turned off when connecting or disconnecting cables.
2. Make sure that the case ground (pin 4) is connected.
3. Make sure that the polarity of the connection between the piezo driver and the
FPS-002 electrical input is correct. Do not apply a negative voltage to the piezo.
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Section 1. Specifications:
Wavelengths 1550, 1310, 1060, or 780nm
Fiber Type
SM: 1310/1550nm: Corning ClearCurve ZBL or equiv.
1060nm: Corning HI1060 or equiv.
780nm: Nufern 780HP or equiv.
PM: 1550nm: Bend insensitive PM with MFD=6.5µm
1310nm: Bend insensitive PM with MFD=6.0µm
1060nm: Nufern PM 980XP or equiv.
Insertion Loss <0.5 dB (at λc, excluding mode coupling loss and
connectors)
Return Loss
>58 dB without connectors
>55 dB with APC connectors
>50 dB with PC connectors)
Total Phase Shift
@500Hz, Vpp=150V >65π(at 1550nm)
Half Wave Voltage (Vπ)
@500Hz
2.5-4.5V typical (small frame)
0.7-1.5V typical (large frame)
Resonance Frequency 8-14kHz typical
Vπ@resonance
frequency 0.1-0.5V typical
PDL SM: <0.05 dB
PM: <0.1 dB
PER PM: >18 dB with connectors
Residual Amplitude
Modulation ±0.01 dB (at 1550nm)
Capacitance of Piezo 0.18µF
Maximum Applied
Voltage 150V
Electrical Interface Molex WM9131-ND or equivalent
Operation Temperature 0 to 50° C
Storage temperature −40° to 85° C
Fiber Length (Internal)136 ± 2 cm (small frame)
93 ± 2 cm (large frame)
Dimensions
Small frame: 35.0 (L) ×17.0 (W) ×10.0 (H) mm
Large frame: 45.0 (L) ×27.0 (W) ×11.0 (H) mm
Notes: Unless otherwise stated, specifications in this table are for devices without connectors at 23±5°C.
1. From edge of enclosure at input port to edge of enclosure at output port, not including boots or
pigtails. Total fiber length including pigtails will be provided in test data for each FPS-002.
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Section 2. Overview
The FPS-002 is a high speed, long range phase shifter with a range of up to 65πand an
operating frequency range of 0 to 20 kHz. It was designed to have 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.
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-002 phase shifter
2.1 Electrical Interface
Electrical Interface: Ribbon cable with 4-pin connector
Electrical Connector: Molex WM9131-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-002 has 2 fiber pigtails for the input and output signals. Input and output are
interchangeable.
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2.3 Mechanical Dimensions
a) Smaller package
b) Larger package
Figure 2 Mechanical dimensions of FPS-002
Two versions of the FPS-002 package are available. The package size used is chosen for
compatibility with the bend radius requirements of the fiber used. Figure 2 shows the
mechanical dimensions of the FPS-002 packages, including the size and locations of
mounting holes. There are 4 mounting holes, one at each corner. 0-80 screws can be used
for mounting.
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Document #: GP-IN-FPS-002-11 Page 7 of 9
Section 3. Operation Instructions:
3.1 Getting started
Unpacking
Inspect FPS-002 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-002, 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-002 electrical cable. Make sure that the polarity is correct.
2. Ground the case ground pin (pin 4).
3. Connect input and output fibers to FPS-002. 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.
4. 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-002 uses a piezo with a capacitance of about 0.18 µF.
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 20 kHz.
1. Never apply a voltage higher than 150V to the FPS-002. Do not apply a
negative input voltage to the FPS-002. Be careful when using high
voltages. Do not touch the cable or connector when the power is on.
2. Adjust the piezo driver voltage to achieve the desired delay at the desired
modulation frequency. See
3. Figure 3 for typical performance data.
off the electrical drive signal and light source when the FPS-002 is not in
use.
4. Turn

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(a) SM fiber on small frame tested at 1550nm (b) SM fiber on small frame tested at 1550nm
PhaseShiftvs.InputVoltage(Vpp)
withfrequencyfixedat500Hz
0
20
40
60
80
100
120
140
160
180
0 30 60 90 120 150
InputVoltage(Vpp)
Phaseshift(π)
(c) PM fiber on large frame tested at 1550nm
Phaseshiftvs.Frequency
amplitudeis15V,offsetis7.5V
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
0 5 10 15 20
Frequency(kHz)
PhaseShift(π)
(d) PM fiber on large frame tested at 1550nm
Figure 3 Typical performance data.

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Section 4. Technical Support
The FPS-002 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-002, or future suggestions,
please contact General Photonics Corporation at (909)-590-5473 (telephone) or (909)-
902-5536 (fax), or by e-mail at [email protected]. General Photonics will
respond to all customer questions within 24 hours during regular business hours. You can
also write to:
General Photonics
14351 Pipeline Avenue
Chino, California 91710
USA