New Focus 145 series Manuale utente
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Instra
Models 141X, 143X, 144X & 145X
USER’S MANUAL
FIBER-COUPLED, ULTRAHIGH-SPEED
PHOTODETECTOR MODULES
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TABLE OF CONTENTS
141522 Rev.D
HANDLING PRECAUTIONS ..............................................................3
QUICK START ........................................................................................4
INTRODUCTION ..................................................................................5
OPERATION ..........................................................................................6
APPENDIX 1: USING AN OPTICAL FIBER ..................................10
APPENDIX 2: USING THE CORRECT
MICROWAVE CONNECTOR..................................11
APPENDIX 3: INSIDE THE PHOTODETECTOR MODULE ......12
TROUBLESHOOTING........................................................................13
DETECTOR CHARACTERISTICS ....................................................16
WARRANTY, SERVICE & SUPPORT ..............................................18
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Is a registered trademark of
New Focus, Inc.
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HANDLING PRECAUTIONS
The detector is sensitive to electrostatic discharges and could be
permanently damaged if subjected even to small discharges. Prior
to handling, or making connections, be sure to ground yourself
adequately. A ground strap provides the most effective grounding
and minimizes the likelihood of electrostatic discharge.
Do not over-torque the microwave K-connector. Excessive torque
can damage connectors.
Make sure the optical connector is clean and undamaged before
connecting to the detector module.
QUICK START
The Models 141X and 144X are high-speed InGaAs photodetector
modules for detection of light of wavelengths 950 to 1650 nm. The
143X and 145X are high-speed InGaAs photodetector modules for
detection of light of wavelengths 400 to 1650 nm. All the models
are 50-Ωterminated. An internal battery and bias circuitry make
the modules self-contained so that no additional power supplies
or bias circuitry are needed.To operate the modules, follow these
instructions:
1. Take proper precautions to avoid electrostatic damage to
the photodiode. (See the Handling Precautions above)
2. Remove module from its case.
3. Turn on power using the “Off/On” switch.
3
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QUICK START
(Perform steps 4, 5 and 6 if using the detector for the first time or
you wish to check the battery and DC offset.)
4. Connect a voltmeter to the “Bias Monitor” SMA connector.
5. Press “Batt Chk” button. The voltage should be at least 3.5 V.
6. Release the “Batt Chk” button. Without an optical input, the
voltage should be less than 10 mV.
7. Connect the photodetector module to your measurement
instrument, being careful not to over-torque the K-connector.
The instrument must have a 50-Ωinput impedance.
8. Check that the optical power emerging from your fiber is
below the Max. Pulse Power or cw Saturation Power as
appropriate (see the Detector Characteristics section of this
manual) to ensure detector linearity and to avoid detector
damage.
9. Connect your optical fiber to the connector on the detector
module.
10.When finished using the module, turn off power to preserve
battery life.
If any of these steps present problems or you would like more
information, please consult the remainder of this manual.
4
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INTRODUCTION
Ultrahigh-speed measurements are easy with the Models 141X,
143X, 144X and 145X high-speed photodetector modules. These
modules convert your optical signals to electronic signals, in effect,
giving every high-speed/high-frequency instrument in your lab
an optical input. The modules are connected directly to the test
instrument or amplifier, eliminating the need for coaxial cables fol-
lowing the photodetector which can seriously distort picosecond
pulses and attenuate microwave signals.The optical signal is
delivered to the Schottky photodiode in the module through a
single-mode or multi-mode optical fiber. Moreover, the photodi-
ode bias circuit and battery are self-contained, eliminating the
hassle of external power supplies and expensive bias networks
and reducing the possibility of photodiode damage due to over-
voltage.
New Focus offers a total of eight models, allowing you to match
your wavelength of interest and the connector style of your instru-
mentation.The Models 141X and 144X are high-speed InGaAs
photodetector modules for detection of light of wavelengths 950
to 1650 nm, and the Models 143X and 145X are also high-speed
InGaAs photodetectors designed for 400-1650 nm operation .
Models 141X and 143X are optimized for a flat frequency response,
and the Models 144X and 145X are optimized to achieve an
impulse response with minimal ringing. All models are 50-Ωtermi-
nated to reduce reflections in 50-Ωsystems and to make them
compatible with 50-Ωreceiver filters. All detectors have single-
mode FC or ST fiber connectors, and an option (-50) is available for
a 50 µm core multimode fiber input. Each models‘ characteristics
are listed and their responsivity-vs.-wavelength curves are shown
in the Detector Characteristics section of this manual.
5
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OPERATION
Checking the battery and offset voltage:
The battery and offset voltage should be checked regularly to
ensure proper functioning of the detector.
1. Turn on the module using the power switch.
2. Connect the “Bias Monitor” port to a voltmeter.
3. Press and hold the “Batt Chk” button and observe the bias
monitor output.The photodiode bias voltage is momentarily
applied to the “Bias Monitor” SMA connector. A reading of 5 V
on this connector is typical with a new battery; the battery
should be replaced when the voltage reaches 3.5 V.
4. Release the “Batt Chk” button and observe the voltage level on
the voltmeter. Without an optical input, this voltage is the DC
offset plus dark current. This “dark voltage” should be less than
10 mV.
5. If needed, keep the voltmeter connected to the module to
optimize coupling to the fiber.
Making the Microwave Connection
Connect the microwave output connector of the photodetector
module to a 50-Ωinput test instrument such as an oscilloscope
or spectrum analyzer, or other 50-Ωload using the proper torque.
To avoid connector damage and signal distortion, be sure that the
instrument you intend to connect to the module has a compatible
connector. See Appendix 2: Using the Correct Microwave Connector
for a list of connector compatibilities.
Aligning the Photodetector to the Optical Input:
To avoid signal distortion, the optical fiber used to deliver the
optical signal to the photodetector module should be single
mode at the operating wavelength and the cable length should
be no longer than necessary.
6
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OPERATION
1. If you do not currently have an ST- or FC-terminated optical
fiber, use either a pigtail assembly or a fiber collimator (see
Table 1), and align the fiber so that light exits the output fiber
connector. With a pigtail assembly, use a fiber aligner such as
the Model 9091 and its accessories; with a collimator, use the
Model 9854 Opti-Claw or the Model 9016 tiny fiber positioner.
2. Measure the power in the fiber prior to connection to the
module to be sure it is within the safe operating range (see
the Detector Characteristics section of this manual). The Models
20X1-FC and 20X1-ST are useful for this purpose and have the
sensitivity to aid in fiber alignment.
3. Connect the fiber-optic cable to the fiber-optic input on the
detector module.The Bias Monitor may be used to optimize
coupling to the fiber.
7
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OPERATION
Table 1. Fiber-optic cable assembly selection table.
Optical Input Fiber Assembly Required
830 nm wavelength Model 1233 collimator-FC (2 meters) for 1434,1454
1.3 µm wavelength Model 1237 collimator-FC (2 meters) for 1414,1444
1.55 µm wavelength Model 1238 collimator-FC (2 meters) for 1414,1444
600 to 900 nm wavelength Model 1223 pigtail-FC assembly (2 meters) for 1434,1454
1.1 to 1.6 µm wavelength Model 1232 pigtail-FC assembly (2 meters) for 1414,1444
1.1 to 1.6 µm wavelength Model 1222 ST-FC (2 meters)
These assemblies are available from New Focus.
Collimators require an Opti-Claw tilt-mount such as the Model 9854.
Pigtail assemblies require a fiber aligner such as the Model 9091.
Other wavelengths and beam types
Patch Cable
< 2 mm diameter collimated beam at:
8
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APPENDICES
Replacing the battery:
1. Turn off the module and remove the two screws on the back
panel with a Phillips screwdriver. (See Fig. 1.)
2. Remove the back panel and replace the battery.
3. Replace the back panel.
4. Check the battery level as described above.
Fig. 1. Front, side, and rear views of the Models 141X, 143X, 144X and
145X fiber-coupled photodetector modules.
Power Switch
Battery Check Button.
When depressed, bias
voltage is applied to bias
monitor port
2.00 (50.8)
Remove two screws
to replace 9V battery
2.00
(50.8)
3.27 (82.9)
2.25 (57.1)
Bias monitor port.
Output is equal to photodiode current
times 1000 ohms, for one millivolt
per microamp
Output K-connector
Shown with ST connector
for optic input
1411 ST connector
1414 FC connector
1431 ST connector
1434 FC connector
1441 ST connector
1444 FC connector
1451 ST connector
1454 FC connector
9
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