Tektronix SD-42 User manual

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User Manual
SD-42 & SD-46
Optical to Electrical Converter Heads
070-8671-01

Copyright ETektronix, Inc. 1992. All rights reserved.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privileges reserved.
Printed in the U.S.A.
Tektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

WARRANTY
Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship
for a period of one (1) year from the date of shipment. If a product proves defective during this warranty period, Tektronix,
at its option, either will repair the defective product without charge for parts and labor, or will provide a replacement in
exchange for the defective product.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the
warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for
packaging and shipping the defective product to the service center designated by Tektronix, with shipping charges prepaid.
Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the
Tektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any
other charges for products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting
from attempts by personnel other than Tektronix representatives to install, repair or service the product; b) to repair
damage resulting from improper use or connection to incompatible equipment; c) to repair any damage or malfunction
caused by the use of non-Tektronix supplies; or d) to service a product that has been modified or integrated with other
products when the effect of such modification or integration increases the time or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR
IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO
REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO
THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE
LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE
OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH
DAMAGES.

SD-42 & SD-46 User Manual i
Table of Contents
List of Figures ii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of Tables ii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Safety Summary iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Getting Started
Connector Care 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Basics
Connecting Signals 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mean Power Monitor 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Buttons and Lights 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibration 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference
Performance Check 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using This Procedure 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Conventions 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Initialized and Stored Settings 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Menu Selections and Measurement Techniques 3–2. . . . . . . . . . . . . . . . . . . . . .
Limits and Tolerances 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optical Power Monitor Check 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pulse Amplitude and Pulse Width Check 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendices
Appendix A: Accessories A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Accessories A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Accessories A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix B: Specifications B–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SD-42 Characteristics B–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SD-46 Characteristics B–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix C: Replaceable Parts C–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Ordering Information C–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Parts List C–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Index

Table of Contents
ii SD-42 & SD-46 User Manual
List of Figures
Figure 1–1: Sampling Head Compartments in a CSA803
Communications Signal Analyzer 1–3. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–1: SD-42 Front Panel 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–1: Setup to Check Optical Power Monitor Operation 3–3. . . . .
Figure 3–2: Setup to Check Pulse Width and Pulse Amplitude 3–4. . . . .
Figure B–1: SD-42 Frequency Response Curve B–5. . . . . . . . . . . . . . . . . .
Figure B–2: SD-42 Responsivity vs. Wavelength Curve B–5. . . . . . . . . . .
Figure B–3: SD-46 Frequency Response Curve B–6. . . . . . . . . . . . . . . . . .
Figure B–4: SD-46 Responsivity vs. Wavelength Curve B–6. . . . . . . . . . .
Figure C–1: Replaceable Mechanical Parts C–4. . . . . . . . . . . . . . . . . . . . .
List of Tables
Table 3–1: Test Equipment Required 3–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Table B–1: SD-42 Optical-to-Electrical Converter Head Pulse
Characteristics B–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table B–2: SD-42 Optical-to-Electrical Converter Head Power Meter
Characteristics B–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table B–3: SD-42 Optical-to-Electrical Converter Head Environmental
and Mechanical Characteristics B–2. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table B–4: SD-46 Optical-to-Electrical Converter Head Pulse
Characteristics B–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table B–5: SD-46 Optical-to-Electrical Converter Head Power Meter
Characteristics B–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table B–6: SD-46 Optical-to-Electrical Converter Head Environmental
and Mechanical Characteristics B–4. . . . . . . . . . . . . . . . . . . . . . . . . . .

SD-42 & SD-46 User Manual iii
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it.
Only qualified personnel should perform service procedures.
While using this product, you may need to access other parts of the system. Read
the General Safety Summary in other system manuals for warnings and cautions
related to operating the system.
Injury Precautions
This product is indirectly grounded through the grounding conductor of the
mainframe power cord. To avoid electric shock, the grounding conductor must
be connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.
To avoid injury or fire hazard, do not operate this product in an explosive
atmosphere.
Safety Terms and Symbols
These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.
These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the
marking.
Ground the Product
Do Not Operate in
Explosive Atmosphere
Terms in This Manual
Terms on the Product

General Safety Summary
iv SD-42 & SD-46 User Manual
WARNING indicates an injury hazard not immediately accessible as you read the
marking.
CAUTION indicates a hazard to property including the product.
The following symbols may appear on the product:
DANGER
High Voltage ProtectiveGround (Earth)Terminal ATTENTION Referto
Manual
Double
Insulated
Symbols on the Product

Getting Started

SD-42 & SD-46 User Manual 1–1
Getting Started
The SD-42 Optical-to-Electrical Converter Head and SD-46 Optical-to-Electrical
Converter Head are high-performance optical heads for use in the 11800 Series
Digital Sampling Oscilloscopes (including the SM-11 Multi-channel Unit) and
the CSA 803 Communications Signal Analyzer. The SD-42/SD-46 Optical-to-
Electrical Converter Heads are used with SD-22, SD-24, and SD-26 Sampling
Heads. The SD-42/SD-46 converts an optical signal into an electrical signal
which serves as the input to an SD Series Sampling Head.
The SD-42 Optical-to-Electrical Converter Head provides the following features:
HDC to 6.4 GHz optical bandwidth
H≤55 ps optical impulse response (FWHM) with the SD-24 and SD-26,
≤60 ps optical impulse response (FWHM) with the SD-22
H1000 nm to 1700 nm Spectral Response
HMean Optical Power Monitor function
The SD-46 Optical-to-Electrical Converter Head provides the following features:
HDC to 20 GHz optical bandwidth
H≤28.5 ps optical impulse response (FWHM) with the SD-24 and SD-26
H1200 nm to 1650 nm Spectral Response
HMean Optical Power Monitor function

Getting Started
1–2 SD-42 & SD-46 User Manual
Connector Care
The front of the SD-42/SD-46 Optical-to-Electrical Converter Head has a
precision 3.5 mm connector for attaching the optical head electrical signal output
to the lower input connector of an adjacent SD-24 or SD-26. These are high-pre-
cision connectors with a higher mechanical tolerance than standard SMA
connectors. Never attach a cable to a plug-connector if the cable has a worn or
damaged connector — damage may result.
Use extra care when attaching or removing a cable from the connectors. Turn
only the nut, do not turn the cable. When attaching a cable to the Optical-to-
Electrical Converter Head, align the connectors carefully before turning the nut.
Use light, finger pressure to make this initial connection. Then tighten the nut
lightly with a wrench.
For best repeatability and to prolong the life of connectors, use a torque wrench
and tighten the connection to the range of 7–10 lb-in (79–112 N-cm).
The front of the SD-42/SD-46 has a precision FC/PC optical connector
receptacle. This is for attaching a fiber optic signal cable. This connector
receptacle has a locating keyway. To ensure repeatable connections, it is
important to align this keyway on the connector and connector receptacle before
tightening the nut. The nut should be tightened with light, finger pressure only.
The connector receptacle must be kept free of dirt and dust. The cover cap should
be replaced whenever the unit is not in use or a fiber is not connected.

Getting Started
SD-42 & SD-46 User Manual 1–3
Installation
The SD-42/SD-46 Optical-to-Electrical Converter Head fits into the front panel
of an 11800 Series Digital Sampling Oscilloscope or a CSA 803 Communica-
tions Signal Analyzer. See Figure 1–1.
The SD-42/SD-46 Optical-to-Electrical Converter Head converts optical signals
to electrical signals to be sampled. At least one sampling head must be installed
in the oscilloscope for the instrument to sample signals.
For the converted output signal from the SD-42/SD-46 to be sampled, the output
of the SD-42/SD-46 must be connected to the input of an SD-24 or SD-26
Sampling Head (the SD-42 can also be connected to an SD-22). To accomplish
this using the U-link provided with the SD-42/SD-46, the SD-24 or SD-26 must
be in the plug-in slot immediately to the right of the slot occupied by the SD-46.
The output of the SD-42/SD-46 is then connected to the lower input of the
SD-24 or SD-26.
To install a plug-in, first switch off the oscilloscope. Then place the plug-in in a
compartment and slowly push it in with firm pressure. Once the plug-in is
seated, turn the screw shaft on the plug-in to tighten the plug-in in place.
SamplingHead
Compartments
SD-42/SD-46
SD-24/SD-26
Figure 1–1: Sampling Head Compartments in a CSA803 CommunicationsSignal
Analyzer

Getting Started
1–4 SD-42 & SD-46 User Manual

Operating Basics

SD-42 & SD-46 User Manual 2–1
Operating Basics
The Figure 2–1 shows the front panel of the SD-42 Optical-to-Electrical
Converter Head and identifies the button, lights, and connectors (the SD-46 is
the same except for specification differences).
The SD-42 has an FC/PC connector receptacle for optical signal input, a
precision 3.5 mm connector for electrical signal output, two 2 mm sockets for
mean power monitor output, a mean power monitor SELECT RANGE button,
and two range/range overload indicator lights.
Optical Signal
Input Connector
Power Monitor
RangeIndicatorLights
Power Monitor
Range Select Button
Screw Lock Knob
Electrical Signal
Output Connector
Power Monitor
Output Sockets
Figure 2–1: SD-42 Front Panel
Connecting Signals
The signal to be sampled must be coupled via a fiber optic cable (which must be
a single-mode cable for calibrated response) terminated with an FC/PC style
optical connector. This may be direct from the device-under-test/signal source or
can be accomplished using optional cable accessories. A fiber terminated by an
FC/PC style connector is connected to the FC/PC style input on the front of the
SD-42/46. Care must be taken to ensure alignment of the key on the FC/PC
connector with the keyway of the connector receptacle.

Operating Basics
2–2 SD-42 & SD-46 User Manual
Mean Power Monitor
The SD-42/46 Mean Optical Power Monitor allows you to monitor the mean
optical power coupled into the optical input using a digital voltmeter. The two
2 mm MONITOR sockets on the front of the SD-42/46 can be connected to most
common digital voltmeters using the two 2 mm to 4 mm cables supplied with the
SD-42/46. The monitor has two ranges, 1 V/mW and 1 V/mW (calibrated at
1300 nm for single-mode fibers) enabling mean optical input powers from 5 nW
to 5 mW to be measured.
NOTE. The signal output of the SD-42/46 must be connected to a sampling head
or a 50 Wterminator for the power monitor to function.
Buttons and Lights
The front panel of the SD-42/46 has a SELECT RANGE button and two
range/range overload indicator lights. Pressing and releasing the SELECT
RANGE button changes the range of the mean power monitor. The range
indicator light glows green beneath the chosen range on the front panel, either
1 V/mW and 1 V/mW. If the mean optical input power is above the maximum for
that range (that is, 5 mW for the 1 V/mW range or 5 mW for the 1 V/mW range)
the green light will be replaced by a red range overload light. If the red light is
illuminated while the monitor is in the 1 V/mW range, press the RANGE
SELECT button to change the monitor to the 1 V/mW range. If the red light is
illuminated in the 1 V/mW range, an optical attenuator should be fitted in the
optical path before the converter. Under overload conditions, the output signal
from the SD-42/46 may be degraded, and the mean power monitor reading will
be meaningless.
CAUTION. Under no circumstances should optical powers above 10 mW mean or
75 mW peak be applied to the input of the SD-42/46 Optical-to-Electrical
Converter Head.
Calibration
The SD-42 Optical-to-Electrical Converter Head is calibrated for response to
optical signals with wavelength of 1300 nm ±20 nm. Optical signals with
wavelengths in the range of 1000 nm to 1700 nm can be analyzed using the
SD-42 with the responsivity as a function of wavelength being given in

Operating Basics
SD-42 & SD-46 User Manual 2–3
Figure B–2. This responsivity curve is applicable to both the displayed wave-
form and the mean power monitor output.
The SD-46 Optical-to-Electrical Converter Head is calibrated for response to
optical signals with wavelength of 1300 nm ±20 nm. Optical signals with
wavelengths in the range of 1200 nm to 1650 nm can be analyzed using the
SD-46 with the responsivity as a function of wavelength being given in
Figure B–4. This responsivity curve is applicable to both the displayed wave-
form and the mean power monitor output.